Skip to main content
PLOS One logoLink to PLOS One
. 2024 Feb 7;19(2):e0297214. doi: 10.1371/journal.pone.0297214

Positive and negative emotions during the COVID-19 pandemic: A longitudinal survey study of the UK population

Lan Li 1,*, Ava Sullivan 1,2, Anwar Musah 1,3, Katerina Stavrianaki 1,4, Caroline E Wood 1, Philip Baker 1,5, Patty Kostkova 1
Editor: Marcus Tolentino Silva6
PMCID: PMC10849398  PMID: 38324540

Abstract

The COVID-19 pandemic has had a profound impact on society; it changed the way we work, learn, socialise, and move throughout the world. In the United Kingdom, policies such as business closures, travel restrictions, and social distance mandates were implemented to slow the spread of COVID-19 and implemented and relaxed intermittently throughout the response period. While negative emotions and feelings such as distress and anxiety during this time of crisis were to be expected, we also see the signs of human resilience, including positive feelings like determination, pride, and strength. A longitudinal study using online survey tools was conducted to assess people’s changing moods during the pandemic in the UK. The Positive and Negative Affect Schedule (PANAS) was used to measure self-reported feelings and emotions throughout six periods (phases) of the study from March 2020 to July 2021. A total of 4,222 respondents participated in the survey, while a sub-group participated in each of the six study phases (n = 167). The results were analysed using a cross-sectional study design for the full group across each study phase, while prospective cohort analysis was used to assess the subset of participants who voluntarily answered the survey in each of the six study phases (n = 167). Gender, age and employment status were found to be most significant to PANAS score, with older people, retirees, and women generally reporting more positive moods, while young people and unemployed people generally reported lower positive scores and higher negative scores, indicating more negative emotions. Additionally, it was found that people generally reported higher positive feelings in the summer of 2021, which may be related to the relaxation of COVID-19-related policies in the UK as well as the introduction of vaccines for the general population. This study is an important investigation into what allows for positivity during a crisis and gives insights into periods or groups that may be vulnerable to increased negative states of emotions and feelings.

Introduction

Natural disasters have been posited as substantial sources of life stress for both individuals and communities [1]. When confronted with the eminent stressor of disaster or emergencies, individuals commonly experience a range of emotions, including fear, anxiety, sadness, and anger [2]. The COVID-19 pandemic, which emerged in the UK in January 2020, has exposed Britons to prolonged stress related to the ongoing health crisis [1]. Various studies have provided evidence that such catastrophic events can result in significant emotional distress and have long-lasting adverse effects on an individual’s subjective well-being. Understanding emotional well-being in the context of disasters becomes crucial in assessing individuals’ coping abilities during emergencies and determining whether their well-being is compromised to the extent that it impairs their normal functioning. In addition, mental well-being is considered a critical element of community resilience during the response and recovery phase of a disaster [3].

Between March 2020 and July 2021, the UK government issued a series of policies and restrictions to curb the spread of the virus, such as social distancing, lockdowns, and travel bans [47]. With these back-and-forth policy changes, people’s mental stress and emotions have risen and fallen, leading to anxiety, depression, and negative emotions [8, 9]. During this time, people have experienced myriad feelings related to the pandemic, including loneliness from lockdown, fear of illness, and uncertainty due to changing rules and regulations [10]. However, given the prolonged period over which the COVID-19 pandemic occurred and the sheer resilience of humans during disasters, there have also been moments of joy, inspiration, and gratitude. Surprisingly, these moments are not simply despite the disaster, but rather positive moments directly related to the changes and response to the pandemic [11].

Many recent studies using cross-sectional surveys examined the emotional impact of the COVID-19 pandemic among children [12, 13], college students [14], healthcare workers [15, 16], and the general population [8]. It is widely acknowledged that the pandemic significantly influences people’s mental health due to the health crisis and uncertainties, and these effects have uneven effects on certain vulnerable groups [9]. Longitudinal cohort studies carried out in the UK demonstrated that mental health deteriorated in the early stage of lockdown (31 March to 9 April 2020) [17, 18]. Other longitudinal evidence gathered from Germany [19], China [20, 21], Austria [22], and France [23] and systematic reviews [2426] demonstrated that the impact of lockdown on emotions varies among countries and timings. However, since most of the longitudinal studies focused on the initial stage of the pandemic and fewer tracked the post-pandemic, it is hard to investigate the relationship between the policy change over the whole period and how individuals’ feelings changed during different periods of the prolonged pandemic. This element may be particularly important to understand the broader public’s tolerance and well-being during a disaster and to understand public health and mental health trade-offs inherent in disaster response efforts [27].

Throughout the COVID-19 pandemic, policies and public health measures have been enacted to curb the spread of the virus in communities. These policies often dictated the type and frequency of non-essential activities and movement, such as travel bans, group size limits, and venue closures. In general, the severity and scale of the policies themselves are related to the severity of COVID-19 in the country. As the pandemic spread throughout Britain, public health measures rushed to respond to the increased morbidity and mortality within the UK. This study aims to assess the change in emotions and feelings during the COVID-19 pandemic to the restrictions that were in place during the number of phases of the pandemic throughout the study period. During the study period, the UK underwent a series of ‘lockdowns’ representing the most stringent measures of restricted movement, business closures, and gathering limitations. During the same period, Britons also experienced periods of more relaxed restrictions, when risk levels were deemed in decline, and social freedoms were restored to certain extents based on national or local risks. These periods of fluctuating restrictions and reversals are mapped in Fig 1. The longitudinal surveys were collected at six study points, called ‘Phases’, throughout this period of fluctuating public health restrictions. During each phase, the predominant qualities of the time related to COVID-19 restrictions allowed researchers to understand a potential driver for positive or negative feelings measured by the standard Positive and Negative Affect Schedule-Trait scale (PANAS).

Fig 1. Data collection phases based on COVID-19 policy and public health measures.

Fig 1

This study aims to measure the emotional changes experienced throughout the pandemic longitudinally across people living in the UK. The study period reflects various COVID-19 caseloads in the UK and various policies set forth to curve the spread.

Methodology

Participants and study design

This study is a part of the ‘To Zoom or Not to Zoom’ project, which is designed to investigate the influence of the COVID-19 pandemic on lifestyle, activity changes, and related emotions throughout the UK population. While the analyses of changing activities are discussed in another paper [28], this analysis is focused on the emotional response to changing public health restrictions during the COVID-19 pandemic.

The project consists of six surveys conducted fully online, covering the course of the pandemic and various stages of lockdown over fifteen months (April 2020 to July 2021). The sampling was opportunistic, drawn from UK residents through Facebook advertising, mutual aid groups, and other social media channels. Participants were required to be 18 years of age or older. The convenience sampling method was used to maximise the sample size within the limited timeframe and resources. In April 2020, 3240 participants voluntarily completed the survey and provided their email addresses for follow-up. The five follow-up surveys were carried out through sending emails to the same email lists in May 2020 (n = 1399), October 2020 (n = 856), December 2020 (n = 1050), June 2021 (n = 1298) and July (n = 1036). New participants were recruited through Facebook advertising during the third survey period in October 2020 (n = 1762) and the fourth survey in December 2020 (n = 143). All the survey data was collected via SurveyMonkey.com.

The participants were asked to respond to demographic questions in each survey, including age, gender, education, employment, demographics, and COVID-19 infection history. The survey also includes questions regarding the frequency and mode of access for 16 different activities, analysed separately to assess the behaviour change during the pandemic [29]. The completion of these questions was optional. The full questionnaire is enclosed in the S1 File.

PANAS scale

The standard Positive and Negative Affect Schedule-Trait (PANAS [28]) scale was used to measure mood and feelings. The PANAS scale is a self-reported psychological scale with ten positive markers and ten negative markers [30]. The Positive Attribute (PA) subscale reflects the extent to which a person feels interested, excited, strong, enthusiastic, proud, alert, inspired, determined, attentive, and active. The Negative Attribute (NA) subscale includes stress, upset, guilty, scared, hostile, irritable, ashamed, nervous, jittery, and afraid. All the items are rated on a scale ranging from 1 (‘very slightly or not at all’) to 5 (‘extremely’). It is the most widely and frequently used scale to assess positive and negative affect and has shown excellent psychometric properties in the general population [3133].

Data cleaning and analysis

To analyse the data, the responses were divided into six study phases according to the timeline of the relevant public health policies in England, as shown in Fig 1. The records that spanned the node f phases were retroactively categorised based on the collection date. All responses with duplicate email addresses were assessed in each phase, and the most completed records were kept. Next, only the records that responded to all 20 items were included. After the deduplication and removal of the incomplete records, there were 4,222 unique participants included in the cross-sectional study and 167 participants agreed to participate in every stage of the project, completing all six surveys included in the prospective cohort study. Table 1 presents the sample size and data cleaning details for each phase, including the final number of participants included in the analysis.

Table 1. Details of data cleaning in each phase.

Study Phase Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 Phase 6
Data collected No. of responses from 1st recruitment N = 3240 N = 1399 N = 856 N = 1050 N = 1298 N = 1036
No. of responses from 2nd recruitment N = 1762 N = 143
Total responses collected N = 3240 N = 1399 N = 2618 N = 1193 N = 1298 N = 1036
No. of responses filtered out due to incomplete records, duplicated email address identifier, low data quality (i.e.. response time<100s) N = 553 N = 1056a N = 664 N = 134 N = 158 N = 146
Final included sample for analysis Sample size N = 2687 N = 343 N = 1954 N = 1059 N = 1140 N = 890
Total responses N = 8073
No. of unique participants N = 4222

a: The large filter-out rate in Phase 2 due to the majority of the data spanning the node of Phase 1 and Phase 2 and being repeated with Phase 1 participants.

Two different study designs have been used to interpret and analyse the survey data. First, a cross-sectional study design was used to understand the general emotional affect and parse the results based on demographic factors throughout the six phases. Second, a prospective cohort study design was used to explore how individuals adapted to the pandemic throughout the phases among a subset of repeated respondents. The latter study design allowed researchers to observe the changes in emotional state over time amongst a small subset of the total respondent pool.

Data reliability was analysed by calculating internal consistency using Cronbach alpha tests separately with the PA and the NA scale items. To analyse the latent structure of the PANAS, a Confirmatory Factor Analysis (CFA) was performed as the PANAS has previously been validated with a theoretical structure of two correlated factors, which are repeatedly found within the model [32, 34]. There was a reasonable fit between the model and the observed data, and the detailed CFA model constructed is enclosed in the S2 File [35, 36].

Several statistical tests were conducted to assess the PA and NA scores differences between phases. Due to the large sample size, histogram and normal Q-Q plots were first used to assess the data distribution visually; the PA score generally fits a normal distribution, and the NA score is skewed (see S3 File). Therefore, for the PA scores, the one-way ANOVA was used to test the overall group difference among phases, and the Tukey-Kramer test was used to perform multiple pairwise comparisons between the means of the groups. For the NA scores, the Kruskal-Wallis rank-sum test was used to test the overall group difference among phases, and the Wilcoxon rank-sum test was used for performing multiple pairwise comparisons between the median of the groups. The null hypothesis is that there is no significant difference in the scores between the tested phases.

One-way ANOVAs were performed to analyse the influence of demographic factors, including age, gender, education, employment, number of households, and garden ownership, on the separate PA and NA overall scores. Using the ANCOVA model, the significant factors were selected as potential covariates in subsequent models on differences among the phases in the mean scores on the PANAS. Confidence intervals were based on 1000 bootstrap samples because of the skewness of the distribution of the negative scores. Post-hoc tests were used to examine the differences between the six phases.

A separate analysis was performed among the subset of repeated measures to assess the individual’s adaption throughout the six phases. Paired Wilcoxon signed-rank tests were used to check whether there were significant differences in the PA and NA mean scores separately between the adjacent phases. For the sake of interpretation and visualisation of the interaction effect, we categorised the PANAS scores into five intervals (0–10, 10–20, 20–30, 30–40, 40–50). Then, alluvial plots were used to display the movement of scores between phases.

The data analysis and visualisation were performed using R Studio version 2021.09.1 [37]. An alpha level of 0.05 was established as the criterion for statistical significance for all analyses done (p-value < 0.05).

Results

Sample description

The total sample comprised 8073 records from 4222 participants; of them, 167 people were included as repeated measures. Within both samples, most participants are female and white with higher education backgrounds (bachelor’s degree and post-graduate degree). It is worth noting that this over-representation of a particular demographic group may affect the interpretation of the results, especially as existing evidence suggests that mental health was more adversely affected in demographic groups with pre-existing health inequalities, which may have been exacerbated during the pandemic [23, 24, 26]. About half of them were employed or self-employed. In terms of the spatial distribution, the bulk of the participants stayed in the south part of England (Top 3 regions: South East 22.52%, London 13.50%, and South West 10.59%). Table 2 presents the demographic details of the two samples. The participant details of each study phase were disclosed in the S1 Table.

Table 2. Demographics and overall PANAS scores on average.

Sample Unique participants Repeated measures Overall PA Score Overall NA scores
Sample size 4222 167 8073
Measures Count (percentage) Count (percentage) Mean (±SD)
Gender
 Female 3521(83.40%) 132(81.99%) 27(±8.05) 19.7(±7.3)
 Male 650(15.40%) 24(14.91%) 27.4(±7.95) 18.3(±7.7)
Age
 18–24 120(2.84%) 4(2.48%) 23.6(±6.68) 22.8(±8.35)
 25–34 278(6.58%) 13(8.07%) 25.9(±7.61) 22.2(±8.05)
 35–44 409(9.69%) 12(7.45%) 25.2(±7.87) 22.8(±7.77)
 45–54 770(18.24%) 25(15.53%) 26.9(±8.05) 20.4(±7.67)
 55–64 1414(33.49%) 48(29.81%) 27(±7.99) 19(±7.12)
 65+ 1204(28.52%) 56(34.78%) 28.2(±8.07) 17.5(±6.43)
Employment
 Employed 2328(55.14%) 84(52.17%) 26.8(±7.98) 20.2(±7.49)
 Not employed 419(9.92%) 13(8.07%) 25.2(±8.07) 21.8(±8.26)
 Retired 1383(32.76%) 61(37.89%) 27.9(±7.98) 17.6(±6.54)
Education
 Post-graduate degree 1334(31.60%) 57(35.4%) 27.5(±8.02) 20(±7.52)
 College or university 1977(46.84%) 79(49.07%) 27.2(±7.9) 19(±7.14)
 Higher or secondary or further education 587(13.91%) 18(11.18%) 25.5(±8.04) 19.9(±7.85)
 Secondary up to 16 years 298(7.06%) 4(2.48%) 25.9(±8.71) 19.3(±7.64)
 Less than secondary 25(0.59%) 0(0%) 25.6(±9.93) 22.2(±9.66)
Household number
 Alone 860(20.37%) 26(16.15%) 26.8(±8.14) 18.9(±7.19)
 2 1970(46.66%) 90(55.9%) 27.2(±8.09) 19.2(±7.41)
 3 635(15.04%) 25(15.53%) 26.5(±7.8) 20.2(±7.7)
 4 516(12.22%) 9(5.59%) 27(±8.02) 20.6(±7.39)
 5 or more 216(5.12%) 8(4.97%) 27.5(±7.83) 20.3(±7.08)

In terms of the PANAS score, Table 2 shows the average PA and NA scores for each demographic group. Table 3 presents the results of the PANAS scores by study phase, allowing researchers to look at the emotional states of the study participants over time. As illustrated in the table, the PA scores in phase 2, phase 5, and phase 6 exceed the average, and the NA scores in phase 1, phase 2, phase 3, and phase 4 are above the average score. The one-way ANOVA test result for the PA scores shows a significant change throughout the phases. Furthermore, the Tukey-Kramer test result shows that the differences between phases 2 and 3, phases 3 and 4, and phases 4 and 5 were significant, with an adjusted p-value below 0.05. The Kruskal-Wallis rank-sum test results show a significant difference in the NA scores. Further, the Wilcoxon test result shows that the differences between phase 3 and phase 4, phase 4 and phase 5, and phase 5 and phase 6 are statistically significant with an adjusted p-value below 0.05. The frequencies and percentages of minimum (10) and maximum (50) scores were tabulated for each sample to examine the potential floor and ceiling effects.

Table 3. PANAS scores overall in each phase and hypothesis test results between phases.

PANAS Score PA scores NA scores PA NA
N Mean SD Min (10) Max (50) Mean SD Min (10) Max (50) F (df) P-value X2 (df) P-value
Phase 1 2687 26.885 7.629 10 (0.37%) 2(0.07%) 20.118 7.301 103(3.83%) 0 Overall test a 27.66 (5,8067) <0.001 205.22 (5) <0.001
Phase 2 343 27.344 8.529 4(1.17%) 1(0.29%) 19.781 7.581 14(4.08%) 0 Post-Hoc test b Diff P-value Diff P-value
Phase 3 1954 25.733 8.201 21(1.07%) 3(0.15%) 20.361 7.619 88(4.50%) 1(0.05%) Phase 2–1 0.459 0.917 -0.337 0.206
Phase 4 1059 26.630 8.234 9(0.85%) 3(0.28%) 19.646 7.703 54(5.10%) 1(0.09%) Phase 3–2 -1.611 0.007 0.58 0.159
Phase 5 1140 28.360 8.018 2(0.18%) 2(0.18%) 18.217 7.135 100(8.77%) 1(0.09%) Phase 4–3 0.896 0.038 -0.715 0.004
Phase 6 890 28.935 7.882 4(0.45%) 2(0.22%) 17.181 6.450 83(9.33%) 0 Phase 5–4 1.730 0.001 -1.429 0.001
Overall 8073 27.027 8.038 50(0.62%) 13(0.16%) 19.508 7.409 442(5.48%) 3(0.04%) Phase 6–5 0.575 0.590 -1.036 0.004

a: Overall test was done by using ANOVA for positive score and Kruskal-Wallis rank-sum test for the negative score.

b: Post-hoc test was done using Tukey-Kramer test (95% family-wise confidence level) for positive score and Wilcoxon rank-sum test for the negative score; only the results of two adjacent phases are recorded.

Positive and negative emotions across key demographics

Fig 2 shows how the PANAS scores were associated with demographic variables. In general, gender, age and education significantly affected the PANAS scores. The ANOVA test result (see S2 Table) shows that males have higher PA scores and lower NA scores than females. People aged 18–24 have the lowest PA and higher NA scores, while older adults over 65 have the highest PA scores. People who are retired have the highest PA score, while unemployed people have the lowest PA and the highest NA scores. People who live in four households have the lowest NA scores (p<0.001), and people who live in two households have significantly higher PA scores. There is no clear pattern among the education groups.

Fig 2. Estimated demographic difference of the positive and negative scores among the whole samples.

Fig 2

Identifying hard times: A cross-sectional look at positivity and negativity at points throughout the pandemic

A Chi-square test was used to determine whether these variables showed phase differences in their distribution, which turned out to be true for all the demographic variables (see S3 Table). These variables thus served as covariates in the subsequent model on differences between the phases in the mean scores on the PANAS (ANCOVA). Confidence intervals were based on 1000 bootstrap samples because of the skewness of the distribution of the negative affect scores. Post-hoc tests were used to examine the differences between the six phases.

Fig 3 shows the estimated mean scores per phase of the PANAS after adjustment for covariates. The overall test for the adjusted mean differences between the phases was significant for both PA and NA scores. There was a significant difference in mean PA [F(5,7449) = 28.607, p <0.001] between the six phases whilst adjusting the demographic covariates. Post-hoc tests for the PANAS showed that participants scored significantly higher on the PA score in phase 6 (Estimated Mean = 27.2; 95% CI: 26.4 to 28.1; p<0.001), phase 5 (Estimated Mean = 26.8; 95% CI: 26.0 to 27.6; p<0.05), and phase 2 (Estimated Mean = 26.1; 95% CI: 24.9 to 27.3; p <0.05), and significantly lower in the other three phases. Similarly, it also shows lower NA scores in phase 2 (Estimated Mean = 20.8; 95% CI: 19.7 to 21.9; p <0.05), phase 5 (Estimated Mean = 20; 95% CI: 19.3 to 20.8; p <0.05) and phase 6 (Estimated Mean = 19.2; 95% CI: 18.4 to 20; p <0.05), which indicate that people tend to have better emotional status in these three phases.

Fig 3. The adjusted model results display the PANAS score difference among phases.

Fig 3

*Estimated means and standard errors (SE) based on 1,000 bootstrap samples from ANCOVA models adjusted for age, gender, education, employment, and household number.

Emotional ups and downs: Following the cohort throughout the pandemic

The change in positive and negative effects among the repeated measures throughout the 5 phases was illustrated in the Alluvial diagrams (Fig 4). Each colour represents 10-point intervals from the lowest 0–10 in dark green to the highest 40–50 in light green. The higher scores represent more positive or more negative. The Wilcoxon signed-rank test was used to test the change between the adjacent phases. As indicated in the graph, there is no significant difference for both positive and negative scores between phases 1 vs. 3 and phases 3 vs. 4, with all p-values greater than 0.05. Nevertheless, from phase 4 to phase 5, the PA score significantly increased while the negative score decreased considerably, with both p-values less than 0.05, which indicates this population has more positive emotions in phase 5 than in phase 6. Similarly, the negative score also significantly decreased from phase 5 to phase 6 (p-value<0.05), although the PA score does not show significant changes, indicating people were generally less negative in phase 6 than in phase 5.

Fig 4.

Fig 4

The dynamics of the PANAS scores change among phases shown by the alluvial plots (Left: PA score; Right: NA score; each line is represented by a line connecting their PANAS scores in each phase, coloured by the former phase) (N = 167; Phase 2 was excluded due to insufficient sample size). Notes: (1) Size of the bar represents the number of participants whose PANAS score falls into the corresponding range; (2) Coloured lines represent the PANAS scores of participants moving between phases, coloured by the former phase; (3) Phase 2 was excluded due to insufficient sample size.

Discussion

We performed a longitudinal survey study to assess the emotional states of people living in the UK during the COVID-19 pandemic. Researchers looked at various demographic groups across six phases using the Positive and Negative Affect Schedule (PANAS) to understand key differences in emotional states across groups. A cross-sectional, as well as a cohort approach to data analysis was used to understand the general emotional state at certain moments during the pandemic and the change in emotional state through time. We summarise the key findings, the strengths and limitations of our study and provide recommendations for future research in this section.

Key findings

Demographics that were found most significant to PANAS score were gender, age and employment. In general, our study found that gender had a significant relationship with reported emotional state. Throughout the study phases, females, on average, reported a higher PANAS score (more positive emotions) than male respondents. This is surprising in light of multiple findings that suggest that women were more likely to suffer more mental health problems during lockdown [18, 23, 24, 38, 39]. In addition, our study found that older adults (aged 55 and above) tended to exhibit more positive and less negative emotional responses compared to younger individuals, which is consistent with a large-scale study conducted in the UK [40]. It is found that younger individuals reported higher levels of anxiety, depression, and loneliness during lockdown, as well as an increase in loneliness over time, while older adults showed greater resilience to negative emotions [40]. Older females, which made up a large part of the sample, were generally very positive and less negative than younger groups. This differs from the findings presented by Ramiz et al., which demonstrated that older females were more likely to have symptoms of depression and anxiety during the lockdown [23]. These discrepancies may be explained by the following reasons: firstly, it is important to note that most previous studies focused on psychological disorders or symptoms, such as anxiety, depression and suicide. In contrast, this study explored the emotional status using the PANAS scale, which measures emotional affect rather than psychological symptoms. Measuring emotions involves capturing subjective, momentary experiences, which can be influenced by a wide range of situational and environmental factors, while psychological conditions are typically assessed using standardised diagnostic criteria that require a certain level of symptom severity and duration [41, 42]. As such, emotions can be more variable and dynamic compared to psychological conditions. Furthermore, this study takes the longer pandemic period into account, while other studies only focus on the initial stage of lockdowns. Therefore, the inconsistency may partly be explained by the different measurements and time frames. Further qualitative studies will be helpful in identifying the detailed reasons and placing these results into context.

Regarding employment, retired people reported more positive and less negative emotional states, while people who were not employed were the most negative. Employment status posed a significant challenge during the pandemic, with 24% of UK jobs at risk during the lockdowns [43]. Despite the age bracket that many retirees fall into, which is generally considered ‘high-risk’ in terms of health concerns during the pandemic, this demographic reported more positive and less negative feelings. This may be attributed to the fact that losing a job due to the pandemic is a large source of fear and anxiety [4446]. This also could be attributed to the fact that many retirees’ activities and lifestyles were less affected by lockdowns, as their commutes to work, occupation, and child-rearing were frequently unchanged [29, 47].

The above demographic factors were subsequently considered in constructing the ANCOVA model to balance the demographic difference between samples. The adjusted result shows people are more positive in phases 5 and 6 (which displays the higher adjusted PA score and lower adjusted NA score) and more negative in phases 3 and 4. The individual PANAS score change was finally analysed among the repeated measures. The result shows that people have higher PA scores and lower NA scores in phase 5 and phase 6, which are consistent with the adjusted model, indicating that people have more positive emotions in phase 5 and phase 6 after the so-called ‘Freedom Day’ on July 19, 2021. Phases 3 and 4 represent some of the most restrictive lockdowns in the UK. Phases 2 and 3 came after the first lockdown, which may show less negative reaction based on the novelty and hope inherent in the earliest days of the pandemic. While surely full of uncertainty, the first lockdown was also a time when people thought our collective engagement with COVID-19 may be a couple of weeks long. Unsurprisingly, phases 3 and 4 show a higher level of negative emotions such as sadness, fear, and anxiety. Phases 5 and 6 are the phases in which negative emotions are less strong, and positive emotions were reported at a higher level. Phases 5 and 6 include the general relaxing of COVID-19 restrictions, as well as the commencement of ‘Freedom Day’ in the UK, setting for the end of all COVID-19 restrictions. Unsurprisingly, there are generally more positive emotional states reported during this time.

It is worth considering that the emergence of community-based mutual aid groups and activities such as NHS volunteering and clapping for healthcare workers in the early stages of the pandemic provided a sense of solidarity and support for individuals during a time of uncertainty and fear [4850]. However, as the pandemic continued and local services began to catch up with demand, people may have experienced a sense of decreased reliance on their communities and a shift towards negative emotions, such as anxiety and fear [51]. This may have contributed to the change in emotional responses observed between the early and later stages of the pandemic. A longitudinal study in the UK found a decline in physical activity during the early stage of the COVID-19 pandemic [40]. Given the established link between physical activity and the health [5254], it may also partly explain the difference in emotional responses between phase 1 and phase 2. However, further work may be important to understand who may be reporting increased negative emotions during periods of relaxed restriction, including vulnerable groups such as the immunocompromised, who are protected by stringent mask-wearing or social distancing.

This study offers valuable insights into the emotional challenges and strengths individuals faced during the pandemic, providing essential information to shape policies and interventions that support emotional well-being in crisis situations. The empirical evidence presented in this research highlights the detrimental emotional impact of lockdowns and uncertainty during the early stages of the COVID-19 pandemic, particularly among specific demographic groups. Monitoring emotional changes becomes crucial in comprehending the complex experiences people undergo when public health measures are enforced, thereby informing future health policies for potential pandemics. The findings indicate that younger individuals, males, and the unemployed were more prone to negative emotions during the pandemic. To address this, targeted interventions from government, local authorities, universities, and voluntary organisations might be necessary. Such interventions could be vital not only during pandemics but also in addressing the lasting effects on social networks and employment for these specific groups. Future research could focus on investigating the long-term emotional experiences and well-being of diverse populations affected by the COVID-19 pandemic. Additionally, examining the effectiveness of interventions aimed at promoting positive emotional responses would be beneficial in refining strategies for handling similar crises in the future.

Strengths, limitations and further research

To our knowledge, the present study is the first to evaluate the emotional status using the PANAS in a British population throughout the pandemic, assessing the emotional impact of various stages of restrictions. Secondly, it has rich data, which included 4,222 unique participants and 6 phases at different time points of the pandemic, covering three main lockdowns and the early post-lockdown stage in the UK. The mixture of cross-sectional and prospective-cohort methods also provided robust evidence to support the conclusions.

However, there are several limitations to consider. Firstly, the study is not based on a nationally representative sample, although it does have a wide inclusion across all socio-demographic groups. The result is more representative of older and highly educated females living in the south part of England, which has more affluent and urban areas, particularly in the southeast region. While we have taken measures to ensure a diverse sample, we acknowledge that our findings may not generalise to other populations or individuals in regions with higher levels of social deprivations or large northern cities. It is possible that diverse experiences were not adequately captured. However, we sought to correct some of this bias by using statistical methods, although we acknowledge the limited generalizability and a note of caution in interpreting the findings. Secondly, we acknowledge that the reliance on convenience sampling through social media may have led to biased sampling and may not represent the wider population. By recruiting online, we may have missed out on reaching certain populations who do not engage with social media, such as older generations or those with limited access to technology. It is important to note that these limitations may affect the generalizability of our findings and should be considered when interpreting the results. Future research should consider more representative sampling methods to address these limitations. Thirdly, since the PANAS score is a self-reported scale, the length of the questionnaire may affect people’s answers. However, we tested the data reliability using multiple measurements, and the possible contaminated data were removed for analysis. In addition, the measure did not capture what or why participants were scoring differently by phases. Thus, it was impossible to assess if other personal or social reasons contributed to the changes.

Because of the need for more representation within our sample, we are keen to analyse the data for women in the older age bracket as a stand-alone analysis. While this group could be considered ‘high risk’ for serious complications due to COVID-19, it was also some of the most positive in our study. An analysis of the emotional states and the activities of this demographic is vital for understanding resilience during a pandemic in future work. It is interesting to identify key protective factors to the positivity of this group during challenging times.

Conclusion

Disasters are one of the most significant life stressors, with the potential to affect our mental well-being and even our ability to recover. Taking inventory of emotional response to disaster is a critical piece in understanding individual and community capacity for resilience. While our findings suggest that older people, retirees, and women generally reported more positive moods throughout the pandemic, and people generally reported more positive feelings in the summer of 2021, it is important to note that this study primarily assessed a group of well-educated older women living in a relatively affluent region. As such, our conclusions should be considered exploratory in nature and not generalisable to all older adults in the UK. Nevertheless, our study highlights the importance of collecting data on positive mood states during pandemics to inform policy and communication strategies. Going forward, future studies should aim to include more diverse samples, collecting data on both positive and negative mood states, as well as symptoms of psychological distress, during pandemics to provide a more holistic picture that can inform policy and communication strategies. Despite the potential selection bias and limitations, our study offers valuable insights into the emotional ups and downs experienced during a pandemic and can help identify particularly challenging moments, as well as groups that exhibit particular resilience and hope.

Supporting information

S1 File. Questionnaire.

(DOCX)

S2 File. CFA analysis result for assessing internal reliability.

(DOCX)

S3 File. Histogram and Q-Q plot for checking data distribution.

(PDF)

S1 Table. Participants’ socio-demographic distribution.

(XLSX)

S2 Table. ANOVA test for each demographic subgroup result.

(XLSX)

S3 Table. Chi-square test for assessing demographic differences among phases.

(XLSX)

Data Availability

There are ethical restrictions related to participant confidentiality which prevent the public sharing of minimal data for this study. However, the minimal data are available upon request from University College London (UCL) Institute of Risk and Disaster Reduction (IRDR) Centre for Digital Public Health in Emergencies (dPHE) via email (irdr.dphe@ucl.ac.uk), or through their website (https://www.ucl.ac.uk/risk-disaster-reduction/ucl-irdr-centre-digital-public-health-emergencies-dphe), for researchers who meet the criteria for access to confidential data.

Funding Statement

LL was partially supported by China Scholarship Council (File No. 202008060009). the funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

References

  • 1.Kemp E, Kennett-Hensel PA, Williams KH. The Calm before the Storm: Examining Emotion Regulation Consumption in the Face of an Impending Disaster. Psychol Mark. 2014;31: 933–945. doi: 10.1002/mar.20744 [DOI] [Google Scholar]
  • 2.Grimm A, Hulse L, Preiss M, Schmidt S. Behavioural, emotional, and cognitive responses in European disasters: results of survivor interviews. Disasters. 2014;38: 62–83. doi: 10.1111/disa.12034 [DOI] [PubMed] [Google Scholar]
  • 3.Karmegam D, Ramamoorthy T, Mappillairajan B. A Systematic Review of Techniques Employed for Determining Mental Health Using Social Media in Psychological Surveillance During Disasters. Disaster Med Public Health Prep. 2020;14: 265–272. doi: 10.1017/dmp.2019.40 [DOI] [PubMed] [Google Scholar]
  • 4.Saban M, Shachar T. Social distancing due to the COVID-19 pandemic: Effects of non-urgent emergency department visits. Disaster Emerg Med J. 2020;5: 124–126. doi: 10.5603/DEMJ.a2020.0026 [DOI] [Google Scholar]
  • 5.Colbourn T. Unlocking UK COVID-19 policy. Lancet Public Health. 2020;5: e362–e363. doi: 10.1016/S2468-2667(20)30135-3 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 6.Li L, Aldosery A, Vitiugin F, Nathan N, Novillo-Ortiz D, Castillo C, et al. The Response of Governments and Public Health Agencies to COVID-19 Pandemics on Social Media: A Multi-Country Analysis of Twitter Discourse. Front Public Health. 2021;9: 1410. doi: 10.3389/fpubh.2021.716333 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 7.Narayan PK, Phan DHB, Liu G. COVID-19 lockdowns, stimulus packages, travel bans, and stock returns. Finance Res Lett. 2021;38: 101732. doi: 10.1016/j.frl.2020.101732 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 8.Venkatesh A, Edirappuli S. Social distancing in covid-19: what are the mental health implications? BMJ. 2020;369: m1379. doi: 10.1136/bmj.m1379 [DOI] [PubMed] [Google Scholar]
  • 9.Pedrosa AL, Bitencourt L, Fróes ACF, Cazumbá MLB, Campos RGB, de Brito SBCS, et al. Emotional, Behavioral, and Psychological Impact of the COVID-19 Pandemic. Front Psychol. 2020;11: 566212. doi: 10.3389/fpsyg.2020.566212 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 10.Okabe-Miyamoto K, Lyubomirsky S. Social connection and well-being during COVID-19. 2021 pp. 131–152. https://www.researchgate.net/profile/Shun-Wang-31/publication/350511770_World_Happiness_Report_2021/links/6063d797299bf173677dca9b/World-Happiness-Report-2021.pdf#page=133
  • 11.Gurvich C, Thomas N, Thomas EH, Hudaib A-R, Sood L, Fabiatos K, et al. Coping styles and mental health in response to societal changes during the COVID-19 pandemic. Int J Soc Psychiatry. 2021;67: 540–549. doi: 10.1177/0020764020961790 [DOI] [PubMed] [Google Scholar]
  • 12.Imran N, Zeshan M, Pervaiz Z. Mental health considerations for children & adolescents in COVID-19 Pandemic. Pak J Med Sci. 2020;36: S67–S72. doi: 10.12669/pjms.36.COVID19-S4.2759 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 13.Liu JJ, Bao Y, Huang X, Shi J, Lu L. Mental health considerations for children quarantined because of COVID-19. Lancet Child Adolesc Health. 2020;4: 347–349. doi: 10.1016/S2352-4642(20)30096-1 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 14.Aiyer A, Surani S, Gill Y, Ratnani I, Sunesara S. COVID-19 Anxiety and Stress Surcey (CASS) in high school and college students due to coronavirus disease 2019. CHEST. 2020;158: A314. doi: 10.1016/j.chest.2020.08.312 [DOI] [Google Scholar]
  • 15.Pfefferbaum B, North CS. Mental Health and the Covid-19 Pandemic. N Engl J Med. 2020;383: 510–512. doi: 10.1056/NEJMp2008017 [DOI] [PubMed] [Google Scholar]
  • 16.Ornell F, Halpern SC, Kessler FHP, Narvaez JC de M. The impact of the COVID-19 pandemic on the mental health of healthcare professionals. Cad Saúde Pública. 2020;36: e00063520. doi: 10.1590/0102-311X00063520 [DOI] [PubMed] [Google Scholar]
  • 17.O’Connor RC, Wetherall K, Cleare S, McClelland H, Melson AJ, Niedzwiedz CL, et al. Mental health and well-being during the COVID-19 pandemic: longitudinal analyses of adults in the UK COVID-19 Mental Health & Wellbeing study. Br J Psychiatry. 2021;218: 326–333. doi: 10.1192/bjp.2020.212 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 18.Pierce M, Hope H, Ford T, Hatch S, Hotopf M, John A, et al. Mental health before and during the COVID-19 pandemic: a longitudinal probability sample survey of the UK population. Lancet Psychiatry. 2020;7: 883–892. doi: 10.1016/S2215-0366(20)30308-4 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 19.Ahrens KF, Neumann RJ, Kollmann B, Brokelmann J, von Werthern NM, Malyshau A, et al. Impact of COVID-19 lockdown on mental health in Germany: longitudinal observation of different mental health trajectories and protective factors. Transl Psychiatry. 2021;11: 1–10. doi: 10.1038/s41398-021-01508-2 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 20.Wang C, Pan R, Wan X, Tan Y, Xu L, Ho CS, et al. Immediate Psychological Responses and Associated Factors during the Initial Stage of the 2019 Coronavirus Disease (COVID-19) Epidemic among the General Population in China. Int J Environ Res Public Health. 2020;17: 1729. doi: 10.3390/ijerph17051729 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 21.Wang C, Pan R, Wan X, Tan Y, Xu L, McIntyre RS, et al. A longitudinal study on the mental health of general population during the COVID-19 epidemic in China. Brain Behav Immun. 2020;87: 40–48. doi: 10.1016/j.bbi.2020.04.028 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 22.Pieh C, Budimir S, Humer E, Probst T. Comparing Mental Health During the COVID-19 Lockdown and 6 Months After the Lockdown in Austria: A Longitudinal Study. Front Psychiatry. 2021;12. Available: https://www.frontiersin.org/articles/10.3389/fpsyt.2021.625973 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 23.Ramiz L, Contrand B, Rojas Castro MY, Dupuy M, Lu L, Sztal-Kutas C, et al. A longitudinal study of mental health before and during COVID-19 lockdown in the French population. Glob Health. 2021;17: 29. doi: 10.1186/s12992-021-00682-8 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 24.Robinson E, Sutin AR, Daly M, Jones A. A systematic review and meta-analysis of longitudinal cohort studies comparing mental health before versus during the COVID-19 pandemic in 2020. J Affect Disord. 2022;296: 567–576. doi: 10.1016/j.jad.2021.09.098 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 25.Prati G, Mancini AD. The psychological impact of COVID-19 pandemic lockdowns: a review and meta-analysis of longitudinal studies and natural experiments. Psychol Med. 2021;51: 201–211. doi: 10.1017/S0033291721000015 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 26.Wirkner J, Christiansen H, Knaevelsrud C, Lüken U, Wurm S, Schneider S, et al. Mental Health in Times of the COVID-19 Pandemic. Eur Psychol. 2021;26: 310–322. doi: 10.1027/1016-9040/a000465 [DOI] [Google Scholar]
  • 27.Popa E. Loneliness and negative effects on mental health as trade-offs of the policy response to COVID-19. Hist Philos Life Sci. 2021;43: 15. doi: 10.1007/s40656-021-00372-z [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 28.Rosella L, Bowman C, Pach B, Morgan S, Fitzpatrick T, Goel V. The development and validation of a meta-tool for quality appraisal of public health evidence: Meta Quality Appraisal Tool (MetaQAT). Public Health. 2016;136: 57–65. doi: 10.1016/j.puhe.2015.10.027 [DOI] [PubMed] [Google Scholar]
  • 29.Li L, Sullivan A, Musah A, Stavrianaki K, Wood CE, Baker P, et al. To Zoom or not to Zoom: A longitudinal study of UK population’s activities during the COVID-19 pandemic. PLOS ONE. 2022;17: e0270207. doi: 10.1371/journal.pone.0270207 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 30.Watson D, Clark LA, Tellegen A. Development and validation of brief measures of positive and negative affect: the PANAS scales. J Pers Soc Psychol. 1988;54: 1063–1070. doi: 10.1037//0022-3514.54.6.1063 [DOI] [PubMed] [Google Scholar]
  • 31.Crawford JR, Henry JD. The Positive and Negative Affect Schedule (PANAS): Construct validity, measurement properties and normative data in a large non-clinical sample. Br J Clin Psychol. 2004;43: 245–265. doi: 10.1348/0144665031752934 [DOI] [PubMed] [Google Scholar]
  • 32.Díaz-García A, González-Robles A, Mor S, Mira A, Quero S, García-Palacios A, et al. Positive and Negative Affect Schedule (PANAS): psychometric properties of the online Spanish version in a clinical sample with emotional disorders. BMC Psychiatry. 2020;20: 56. doi: 10.1186/s12888-020-2472-1 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 33.Terracciano A, McCrae RR, Costa PT Jr. Factorial and Construct Validity of the Italian Positive and Negative Affect Schedule (PANAS). Eur J Psychol Assess. 2003;19: 131–141. doi: 10.1027//1015-5759.19.2.131 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 34.DeVellis RF. Classical test theory. Med Care. 2006;44: S50–59. doi: 10.1097/01.mlr.0000245426.10853.30 [DOI] [PubMed] [Google Scholar]
  • 35.Marsh HW, Hau K-T, Wen Z. In Search of Golden Rules: Comment on Hypothesis-Testing Approaches to Setting Cutoff Values for Fit Indexes and Dangers in Overgeneralizing Hu and Bentler’s (1999) Findings. Struct Equ Model Multidiscip J. 2004;11: 320–341. doi: 10.1207/s15328007sem1103_2 [DOI] [Google Scholar]
  • 36.Finch WH, French BF. Latent Variable Modeling with R. New York: Routledge; 2015. [Google Scholar]
  • 37.RStudio Team. RStudio: Integrated Development for R. Boston, MA; 2020. http://www.rstudio.com/
  • 38.Qiu J, Shen B, Zhao M, Wang Z, Xie B, Xu Y. A nationwide survey of psychological distress among Chinese people in the COVID-19 epidemic: implications and policy recommendations. Gen Psychiatry. 2020;33: e100213. doi: 10.1136/gpsych-2020-100213 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 39.Guo Q, Zheng Y, Shi J, Wang J, Li G, Li C, et al. Immediate psychological distress in quarantined patients with COVID-19 and its association with peripheral inflammation: A mixed-method study. Brain Behav Immun. 2020;88: 17–27. doi: 10.1016/j.bbi.2020.05.038 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 40.Bu F, Bone JK, Mitchell JJ, Steptoe A, Fancourt D. Longitudinal changes in physical activity during and after the first national lockdown due to the COVID-19 pandemic in England. Sci Rep. 2021;11: 17723. doi: 10.1038/s41598-021-97065-1 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 41.Berking M, Wupperman P. Emotion regulation and mental health: recent findings, current challenges, and future directions. Curr Opin Psychiatry. 2012;25: 128. doi: 10.1097/YCO.0b013e3283503669 [DOI] [PubMed] [Google Scholar]
  • 42.Izard CE. The Psychology of Emotions. Springer Science & Business Media; 1991.
  • 43.Allas T, Canal M, Hunt V. COVID-19 in the UK: The impact on people and jobs at risk. McKinsey; 2020. https://www.mckinsey.com/industries/public-and-social-sector/our-insights/covid-19-in-the-united-kingdom-assessing-jobs-at-risk-and-the-impact-on-people-and-places
  • 44.Wilson JM, Lee J, Fitzgerald HN, Oosterhoff B, Sevi B, Shook NJ. Job Insecurity and Financial Concern During the COVID-19 Pandemic Are Associated With Worse Mental Health. J Occup Environ Med. 2020;62: 686–691. doi: 10.1097/JOM.0000000000001962 [DOI] [PubMed] [Google Scholar]
  • 45.Killgore WDS, Cloonan SA, Taylor EC, Dailey NS. Mental Health During the First Weeks of the COVID-19 Pandemic in the United States. Front Psychiatry. 2021;12. Available: https://www.frontiersin.org/articles/10.3389/fpsyt.2021.561898 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 46.Ruffolo M, Price D, Schoultz M, Leung J, Bonsaksen T, Thygesen H, et al. Employment Uncertainty and Mental Health During the COVID-19 Pandemic Initial Social Distancing Implementation: a Cross-national Study. Glob Soc Welf. 2021;8: 141–150. doi: 10.1007/s40609-020-00201-4 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 47.Mendez-Lopez A, Stuckler D, McKee M, Semenza JC, Lazarus JV. The mental health crisis during the COVID-19 pandemic in older adults and the role of physical distancing interventions and social protection measures in 26 European countries. SSM—Popul Health. 2022;17: 101017. doi: 10.1016/j.ssmph.2021.101017 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 48.Igwe PA, Ochinanwata C, Ochinanwata N, Adeyeye JO, Ikpor IM, Nwakpu SE, et al. Solidarity and social behaviour: how did this help communities to manage COVID-19 pandemic? Int J Sociol Soc Policy. 2020;40: 1183–1200. doi: 10.1108/IJSSP-07-2020-0276 [DOI] [Google Scholar]
  • 49.Bowe M, Wakefield JRH, Kellezi B, Stevenson C, McNamara N, Jones BA, et al. The mental health benefits of community helping during crisis: Coordinated helping, community identification and sense of unity during the COVID-19 pandemic. J Community Appl Soc Psychol. 2022;32: 521–535. doi: 10.1002/casp.2520 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 50.Tomasini F. Solidarity in the Time of COVID-19? Camb Q Healthc Ethics. 2021;30: 234–247. doi: 10.1017/S0963180120000791 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 51.Li LZ, Wang S. Prevalence and predictors of general psychiatric disorders and loneliness during COVID-19 in the United Kingdom. Psychiatry Res. 2020;291: 113267. doi: 10.1016/j.psychres.2020.113267 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 52.Penedo FJ, Dahn JR. Exercise and well-being: a review of mental and physical health benefits associated with physical activity. Curr Opin Psychiatry. 2005;18: 189. Available: https://journals.lww.com/co-psychiatry/Abstract/2005/03000/Exercise_and_well_being__a_review_of_mental_and.13.aspx doi: 10.1097/00001504-200503000-00013 [DOI] [PubMed] [Google Scholar]
  • 53.Saint-Maurice PF, Troiano RP, Bassett DR Jr, Graubard BI, Carlson SA, Shiroma EJ, et al. Association of Daily Step Count and Step Intensity With Mortality Among US Adults. JAMA. 2020;323: 1151–1160. doi: 10.1001/jama.2020.1382 [DOI] [PMC free article] [PubMed] [Google Scholar]
  • 54.Rhodes RE, Lubans DR, Karunamuni N, Kennedy S, Plotnikoff R. Factors associated with participation in resistance training: a systematic review. Br J Sports Med. 2017;51: 1466–1472. doi: 10.1136/bjsports-2016-096950 [DOI] [PubMed] [Google Scholar]

Decision Letter 0

M Niaz Asadullah

2 Sep 2022

PONE-D-22-14167Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK Population

PLOS ONE

Dear Dr. Li,

Thank you for submitting your manuscript to PLOS ONE. The paper has been read by two competent reviewers. After careful consideration of the reports and my own reading of the paper, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

In addition to accounting for each referee comment, please address the following points:

- There is a sizable literature on mental health (MH) during COVID times which present causal evidence on exposure to pandemic induced lockdown and mental heath exploiting spatial variation in lockdown timing. The manuscript needs to acknowledge this - please update your literature review accordingly - and offer some discussion of how your approach compares and contrasts with other key studies on the topic. 

- Following from the above comment and taking note of concerns of selection  bias highlighted by Referee-1, I expect a more carefully written version in the next round. Since the manuscript claims to offer "creative exploratory analysis and statistical tests" and in conclusion "we performed a longitudinal survey study", please clarify how you achieved this from a methodological point of view that is consistent with the literature  (including a discussion of selection  bias issues) - else, add more to rigor to your empirical analysis during the revision. I say this b/c the dataset is very rich - PANAS longitudinal survey from the UK (March 2020 to July 2021). Yet the analysis is only compares MH (+ve and -ve emotions) across different phases of lockdown. As such, the dynamic nature of the data is not fully exploited. 

- Figures 4 and 5 are not acceptable in terms of quality and format. Please use "actual dates" or "text label" to clearly identify each phase on the x-axis instead of numbers 1-7 (you already have the name description of each phase in Fig 1). Otherwise it's difficult for readers to remember which number corresponds to which phase.

- In Figs 4 & 5, the legends used are not standard and not aligned with terms used in the main text. What do you mean by "Original positive score"? Either say "unadjusted score (positive)" or "raw score (positive)" 

- Fig 2 looks strange. Consider adding corresponding mean values etc and add notes at the bottom to explain what the content stands for. The title is also very confusing "Positive and negative affect states measured by PANAS" b/c there is nothing on "measurement scale" in Fig 2. Please address similar concerns for all other Tables and Figs.

Please submit your revised manuscript by Oct 17 2022 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.

Please include the following items when submitting your revised manuscript:

  • A rebuttal letter that responds to each point raised by the academic editor and reviewer(s). You should upload this letter as a separate file labeled 'Response to Reviewers'.

  • A marked-up copy of your manuscript that highlights changes made to the original version. You should upload this as a separate file labeled 'Revised Manuscript with Track Changes'.

  • An unmarked version of your revised paper without tracked changes. You should upload this as a separate file labeled 'Manuscript'.

If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter.

If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: https://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols. Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols.

We look forward to receiving your revised manuscript.

Kind regards,

M Niaz Asadullah

Academic Editor

PLOS ONE

Journal Requirements:

When submitting your revision, we need you to address these additional requirements.

1. Please ensure that your manuscript meets PLOS ONE's style requirements, including those for file naming. The PLOS ONE style templates can be found at https://journals.plos.org/plosone/s/file?id=wjVg/PLOSOne_formatting_sample_main_body.pdf and 

https://journals.plos.org/plosone/s/file?id=ba62/PLOSOne_formatting_sample_title_authors_affiliations.pdf

[Note: HTML markup is below. Please do not edit.]

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #1: Partly

Reviewer #2: Yes

**********

2. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #1: No

Reviewer #2: Yes

**********

3. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #1: No

Reviewer #2: Yes

**********

4. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #1: Yes

Reviewer #2: Yes

**********

5. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #1: Comments on “Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK Population”

This is an interesting study taking advantage of a panel of six rounds where a sample of respondents participated in all six rounds. Such balance panels are typically hard to find, and it is commendable that the authors could take advantage of this aspect of the survey. My main concern is the sample size and nature of selection. Both of these issues will have implications for how generalizable the findings are at the national or “societal” level.

1. There are two types of selection issues here. One is the recruitment of the respondents was done through social media advertisement along with few other channels (p.6, lines 99-102). Hence, the people who responded may not be representative of the adults at the national level. While the time trend for the respondents in the balanced panel can be useful, any inference drawn using 167 respondents worries me. Few suggestions:

(a) How about reporting the average for the entire sample by rounds? Didn’t they take same PANAS tests? It seems so from Table 1. So, the summary stats based on repeated cross-sectional data will also be very useful as they may have more statistical information.

Another benefit of showing the results from the balanced panel (N = 167) and overall sample (which varied by rounds) is that it will show the robustness of the findings and allow how representative the restricted sample is.

(b) Should we consider deriving some sample weights using population wide data? Obviously, people who self-selected to take part in the survey and further to participate in all six rounds may not be similar to the population. But sample weights can perhaps partially correct the biases.

2. The authors have been able to show that the changes in moods (positive and negative) coincide with the mobility restrictions. Authors may want to present the trends superimposed on a chart which shows the degree of restrictions over time. This will be a very useful visual aide to understand the association between COVID restrictions and mood of people sampled.

3. The authors claim about sample size to be large (p.16, lines 303-304). Should a sample size of 167 be considered large?

4. In terms of analyses, the authors have some covariates which are systematically correlated with the PANAS score. Authors may consider taking different respondent features (gender, age, etc.) and interact with round or the strictness of lockdown. The coefficients for the interaction terms may allow testing how different features are associated with the round specific mood outcomes.

5. Associations of moods with some of the features need some elaboration. Why did women report better mental health outcomes compared to men? Is this typical in the literature? In general, the authors to discuss their findings in the context of what other studies have found so far.

Reviewer #2: The manuscript is well written except a couple of typos scattered throughout text. The paper uses PANAS emotional state measures of positive and emotional states of 4222 people (and 167 observed repeatedly) in UK between March 2020 and October 2021. Two separate study designs are used. The first one is the cross-sectional study which looks at the difference of the emotional states across various demographic groups. The second one is a prospective cohort study that explores the changes throughout the stages of the pandemic.

All the tables for the analysis are included, though some need more sharpness.

**********

6. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #1: No

Reviewer #2: No

**********

[NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.]

While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/. PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org. Please note that Supporting Information files do not need this step.

Attachment

Submitted filename: Covid_UK_Plos1.docx

PLoS One. 2024 Feb 7;19(2):e0297214. doi: 10.1371/journal.pone.0297214.r002

Author response to Decision Letter 0


7 Oct 2022

Thank you for giving us the comments. Please find the file entitled "Response to Reviewer" attached for details. Many thanks!

Attachment

Submitted filename: Response to Reviewers.docx

Decision Letter 1

Guglielmo Campus

15 Mar 2023

PONE-D-22-14167R1Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK PopulationPLOS ONE

Dear Dr. Li,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

Please submit your revised manuscript by Apr 29 2023 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.

Please include the following items when submitting your revised manuscript:

  • A rebuttal letter that responds to each point raised by the academic editor and reviewer(s). You should upload this letter as a separate file labeled 'Response to Reviewers'.

  • A marked-up copy of your manuscript that highlights changes made to the original version. You should upload this as a separate file labeled 'Revised Manuscript with Track Changes'.

  • An unmarked version of your revised paper without tracked changes. You should upload this as a separate file labeled 'Manuscript'.

If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter.

If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: https://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols. Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols.

We look forward to receiving your revised manuscript.

Kind regards,

Guglielmo Campus, Ph.D DDS

Academic Editor

PLOS ONE

[Note: HTML markup is below. Please do not edit.]

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #3: (No Response)

Reviewer #4: (No Response)

**********

2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #3: Yes

Reviewer #4: Partly

**********

3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #3: Yes

Reviewer #4: I Don't Know

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #3: Yes

Reviewer #4: No

**********

5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #3: Yes

Reviewer #4: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #3: Thank you for your manuscript. This is the first time I have seen the paper and have not been able to see your previous response to reviewers, hence my comments take the manuscript without prior knowledge of reviews and on face value.

You present a clear introduction and rationale as to why this study may be needed considering there is limited data assessing changes in the pandemic and individuals responses to it over time. My initial impression is that the discussion could be expanded to go into more depth and engage with more literature. There are some key limitations not mentioned that should be added. Lastly I believe there should be more concrete implications added to the manuscript to answer the 'so what' question, i.e. describing why your findings are useful and what policies, practice or research it can inform in the future. I add more detail on these issues below. I believe if these are addressed, the work will provide an interesting piece of evidence in the COVID literature in the UK.

Line 94 – typo – should this be 'longitudinally'?

Line 279 – why might measuring emotions, rather than psychological conditions have different presentation in the data? You state this may be the reason for finding difference, but then do not explain why this might cause a difference - e.g. I assume it is because emotions can flux more readily that probable conditions - but citing supporting research and explaining further would be useful.

- Further discussion of more context of phases would be useful e.g. In the first phases there were community responses in support and action – neighbourhood and NHS volunteering, clapping emergency support workers (aka we are all in this together - however some of this community spirit may have dissipated at later restricted phases?

- There is a huge amount of evidence collected overtime from the UCL Social Study, but this does not seem to be included or discussed in the discussion - it might benefit from including some of their findings in the context of your study. Additionally what international studies an you cite that have explored longitudinal data and how does this relate to your findings?

Line 321 –you state the geographical limitation but don't explain how this might bias results i.e. may not take into account other areas with higher levels of social deprivation, large northern cities etc. but why limitation –

Line 343 – do you mean 'cross-sectional' ?

Limitations –you make no mention of method of recruitment as being a limitation and possible source of bias – e.g. convenience sampling through social media online. It would be good to add how this might bias who took part in your study. e.g. possible that those who had experienced more problems would be more attracted to take part - it is known in other psychological studies that those with mental health problems are more likely to take part in studies that brand themselves as mental health studies and hence may bias average distress reported in those studies. Additionally by recruiting online and through social media, may bias which populations engage with facebook (for example) and you may not have reached younger or older generations - some noting or discussion of this would be useful.

Implications - It would be useful to discuss what implications these findings have and how/who they might be useful for - e.g. government policy? healthcare practice? future research. Currently the 'so what' question isn't answered fully enough to make these results feel tangible - hence some more discussion of tangible implications would be good.

Reviewer #4: This is manuscript presents an interesting exploratory analysis of changes in positive affect in a longitudinal cohort. The sample available for analysis is relatively small (n=167) and selection bias is a limitation to this study. However, the work does highlight the need to investigate changes in positive as well and negative affect in crisis situations as both dimensions are important to well-being. The PANAS also taps into fluctuation in mood states rather than assessing symptoms of psychological distress. As such, the study raises important questions for consideration and further investigation in developing pandemic response plans and policies.

I have read the previous reviewers' comments and author responses and can see that the manuscript has been significantly improved since the last version. However, there are still some issues that need to be addressed:

Abstract

• Consider rephrasing ‘paralysed the world’

• Ensure it is clear that it is positive affect sub-scale scores that are referred to in the results in this section, with higher scores indicating more positive affect.

Methods

• Page 6, lines 107-112. The sampling approach is a little unusual, with a second wave of recruitment taking place in October and December 2020. As such, these participants would not have completed the earlier surveys and would not have the full five data points available. There is also information about optional lifestyle questionnaires. Was the PANAS part of the optional questionnaire set or the core survey? There is some further information on selection of the sample in the ‘data cleaning’ section. This would be clearer and easier to follow in a single section, with a table or flow diagram to show exactly what data is available at each time point for cross-sectional analysis, and from all time points for longitudinal analysis.

• Analysis and results section mention the NA scale, but this is not covered in the abstract, introduction, or discussion.

Results

• P10, Line 187, as noted in the methods it is unclear what the 8073 records relate to – is this complete PANAS data available for analysis, and for how many unique individuals at each time point – or were these pooled for analysis?

• The demographic profile of the cohort indicates that well-educated middle and older-age females are considerably over-represented in the sample. This sampling issues are common with online surveys, but it is worth considering this during interpretation – particularly as there is ample evidence that mental health was more adversely affected in demographic groups where there were pre-existing health equalities which were exacerbated during the pandemic.

• Table 2 of the results does indicate numbers of data points available for analysis at each time point, and as noted above it would be good to see this come in earlier in the paper so that this is really clear.

• Given the extent of change in participants recruited and exiting the study at different time points, it would be useful to assess the potential for selective drop-out in terms of mental health – especially given the apparent improvement in positive affect during later stages in the study. I.e. were people with higher initial PA and lower NA more likely to be lost to follow-up?

Discussion

There are some interesting elements to the discussion, particularly challenging assumptions about older age and also highlighting the importance of employment and the impact of of of income for working age adults.

However, in this study, you are primarily assessing PA in a group of well-educated older women living in a relatively affluent region. There will be many older adults in the UK affected by poverty, ill-health, lack of digital literacy, social isolation, bereavement and so on who will have had quite different experiences over the course of the pandemic. Therefore, it is important not to over-generalise or overstate the conclusions. It needs to be clear that this is an exploratory analysis that raised interesting questions, but which cannot provide definitive answers at this stage. I would suggest pitching the conclusions more in terms of the importance of collecting data on positive mood states (as well as negative moods states and/or symptoms of psychological distress) during pandemics to enable a more holistic picture to inform policy and communication strategies.

**********

7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #3: No

Reviewer #4: No

**********

[NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.]

While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/. PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org. Please note that Supporting Information files do not need this step.

PLoS One. 2024 Feb 7;19(2):e0297214. doi: 10.1371/journal.pone.0297214.r004

Author response to Decision Letter 1


27 Apr 2023

Dear Reviewers,

Thank you for giving us the opportunity to submit a revised version of our manuscript titled ‘Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK Population’ to PLOS ONE to be considered for publication as Research Article.

We would like to express our gratitude for your time and effort in providing valuable feedback on our manuscript. We have carefully considered all comments and have made significant revisions based on the suggestions provided. We believe that the manuscript has improved substantially as a result of your feedback.

In order to make it easier to follow the changes we have made, we have included the comments provided by the reviewers in tables below, along with our responses and revisions. Please note that all page and line numbers cited in this document correspond to the file "Manuscript".

Once again, we thank you for your valuable feedback and hope that the revised manuscript meets your expectations.

We are very much looking forward to your decision and greatly appreciate your attention and valuable time.

Attachment

Submitted filename: Response to Reviewers.docx

Decision Letter 2

Marcus Tolentino Silva

17 Jul 2023

PONE-D-22-14167R2Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK PopulationPLOS ONE

Dear Dr. Li,

Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process.

Please submit your revised manuscript by Aug 31 2023 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.

Please include the following items when submitting your revised manuscript:

  • A rebuttal letter that responds to each point raised by the academic editor and reviewer(s). You should upload this letter as a separate file labeled 'Response to Reviewers'.

  • A marked-up copy of your manuscript that highlights changes made to the original version. You should upload this as a separate file labeled 'Revised Manuscript with Track Changes'.

  • An unmarked version of your revised paper without tracked changes. You should upload this as a separate file labeled 'Manuscript'.

If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter.

If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: https://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols. Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols.

We look forward to receiving your revised manuscript.

Kind regards,

Marcus Tolentino Silva

Academic Editor

PLOS ONE

Journal Requirements:

Please review your reference list to ensure that it is complete and correct. If you have cited papers that have been retracted, please include the rationale for doing so in the manuscript text, or remove these references and replace them with relevant current references. Any changes to the reference list should be mentioned in the rebuttal letter that accompanies your revised manuscript. If you need to cite a retracted article, indicate the article’s retracted status in the References list and also include a citation and full reference for the retraction notice.

Additional Editor Comments:

Introduction: (1) Clearly state the rationale for investigating emotions during the COVID-19 pandemic and link it to the psychological underpinnings. (2) Provide references to literature supporting the importance of emotions in predicting wellbeing and future mental health conditions.

Discussion: (3) Ensure that the added section in the discussion aligns with the findings presented in the study. (4) Clearly delineate the implications of the work, addressing why the study is interesting, important, and how it can inform policy and practice. (5) Avoid repetition between the first and last paragraph of the discussion. The first paragraph should focus on summarizing what was done and found, while the last paragraph should provide key "take-home messages."

Proofreading: (6) Thoroughly review the manuscript for typographical and grammatical errors. Conduct a comprehensive proofreading to ensure clarity and coherence of the writing.

[Note: HTML markup is below. Please do not edit.]

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #3: (No Response)

Reviewer #4: (No Response)

**********

2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #3: Yes

Reviewer #4: Yes

**********

3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #3: Yes

Reviewer #4: Yes

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #3: Yes

Reviewer #4: No

**********

5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #3: Yes

Reviewer #4: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #3: Thank you for your revisions and comments back to reviewers - the additions do improve the manuscript substantially.

Before this piece can be published - there is a key issue that I do not believe has been adequately addressed and this directly relates to the rationale for the study and what use understanding emotions has for healthcare professionals or policy makers in the future. In your introduction you state the aim of the work: 'This study aims to assess the change in emotions and feelings during the COVID-19 pandemic to the restrictions that were in place during the number of phases of the pandemics throughout the study period.' But you do not then go on to justify a rationale as to why you are investigating this? You state that others haven't measured emotions over a longitudinal period - but you do not address why investigating emotions is important. i.e. I assume investigating emotions is important because of links to wellbeing, predicting distress or future mental health conditions, important to know which groups are at risk and who may need support in the future. However you don't present a rationale or link to literature explaining why investigating emotions is important but make an assumption that emotions and wellbeing are tied - please cite some literature so readers can understand the psychological underpinning of where emotions sit in relation to predicting wellbeing or future mental health. This will then help your discussion.

In your discussion you have added a section from line 365 trying to address why this research is important and what implications it might have for policy and practice - yet it doesn't seem to entirely tie in with your findings - your findings demonstrate that those who were male, younger and not employed were more likely to have negative emotions over the pandemic - hence government, local authorities, universities and voluntary organisations may also need to look at how interventions can be targeted to these groups, not only during pandemics, but these groups may have lasting effects of the pandemic on their social networks and employment.

Thank you again - I believe the manuscript is nearly there, but I still think the rationale for the study and the implications are not clear enough yet.

Reviewer #4: The manuscript is much improved since the last version, with greater clarity around the exploratory nature of the study and what can and cannot be concluded from the findings.

There is significant repetition between the first and last paragraph of the discussion and this should be reviewed. The first paragraph should focus on a brief summary of what was done and what was found. The conclusions on summarising key 'take home messages'.

The writing is clear and of a high standard overall, but there are numerous typographical and grammatical errors throughout and thorough proof reading is required.

**********

7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #3: No

Reviewer #4: No

**********

[NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.]

While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/. PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org. Please note that Supporting Information files do not need this step.

PLoS One. 2024 Feb 7;19(2):e0297214. doi: 10.1371/journal.pone.0297214.r006

Author response to Decision Letter 2


10 Aug 2023

Dear Reviewers,

Thank you for giving us the opportunity to submit a revised version of our manuscript titled ‘Positive and Negative Emotions during the COVID-19 Pandemic: A Longitudinal Survey Study of the UK Population’ to PLOS ONE to be considered for publication as Research Article.

We would like to extend our sincere gratitude for your dedicated time and effort in reviewing our manuscript. Your valuable feedback has been immensely helpful in improving the quality of our work. We have taken all your comments into careful consideration and made revisions accordingly.

Notably, we have revised the rationale, strengthening its clarity and relevance. The discussion section has been thoroughly reviewed to ensure a more coherent presentation of our findings and a clear delineation of the implications of our work. Moreover, we have meticulously addressed any repetition between the discussion and conclusion, ensuring each section serves its distinct purpose.

To facilitate an easy understanding of the revisions, we have included the reviewer and editor's comments in the tables below, along with our responses and corresponding changes. All page and line numbers cited in this document correspond to the file "Manuscript."

We genuinely appreciate the time and expertise you have devoted to reviewing our work, and we are confident that the revised manuscript now meets your expectations.

Thank you once again for your invaluable feedback. We eagerly await your decision and remain grateful for your attention and valuable time.

Attachment

Submitted filename: Response to Reviewers.docx

Decision Letter 3

Marcus Tolentino Silva

2 Jan 2024

Positive and Negative emotions during the COVID-19 Pandemic: A longitudinal survey study of the UK Population

PONE-D-22-14167R3

Dear Dr. Li,

We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements.

Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication.

An invoice for payment will follow shortly after the formal acceptance. To ensure an efficient process, please log into Editorial Manager at http://www.editorialmanager.com/pone/, click the 'Update My Information' link at the top of the page, and double check that your user information is up-to-date. If you have any billing related questions, please contact our Author Billing department directly at authorbilling@plos.org.

If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org.

Kind regards,

Marcus Tolentino Silva, Ph.D.

Academic Editor

PLOS ONE

Additional Editor Comments (optional):

Reviewers' comments:

Reviewer's Responses to Questions

Comments to the Author

1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation.

Reviewer #4: All comments have been addressed

**********

2. Is the manuscript technically sound, and do the data support the conclusions?

The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented.

Reviewer #4: Yes

**********

3. Has the statistical analysis been performed appropriately and rigorously?

Reviewer #4: Yes

**********

4. Have the authors made all data underlying the findings in their manuscript fully available?

The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified.

Reviewer #4: No

**********

5. Is the manuscript presented in an intelligible fashion and written in standard English?

PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here.

Reviewer #4: Yes

**********

6. Review Comments to the Author

Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters)

Reviewer #4: All recommended changes have been completed. The manuscript is now clear and provides an important insight into positive mood changes, as well as negative mood, during the COVID-19 pandemic, highlighting the need to make a more holistic assessment of well-being when evaluating the impact of pandemics and associated policies.

**********

7. PLOS authors have the option to publish the peer review history of their article (what does this mean?). If published, this will include your full peer review and any attached files.

If you choose “no”, your identity will remain anonymous but your review may still be made public.

Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy.

Reviewer #4: No

**********

Acceptance letter

Marcus Tolentino Silva

29 Jan 2024

PONE-D-22-14167R3

PLOS ONE

Dear Dr. Li,

I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now being handed over to our production team.

At this stage, our production department will prepare your paper for publication. This includes ensuring the following:

* All references, tables, and figures are properly cited

* All relevant supporting information is included in the manuscript submission,

* There are no issues that prevent the paper from being properly typeset

If revisions are needed, the production department will contact you directly to resolve them. If no revisions are needed, you will receive an email when the publication date has been set. At this time, we do not offer pre-publication proofs to authors during production of the accepted work. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few weeks to review your paper and let you know the next and final steps.

Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org.

If we can help with anything else, please email us at customercare@plos.org.

Thank you for submitting your work to PLOS ONE and supporting open access.

Kind regards,

PLOS ONE Editorial Office Staff

on behalf of

Prof Marcus Tolentino Silva

Academic Editor

PLOS ONE

Associated Data

    This section collects any data citations, data availability statements, or supplementary materials included in this article.

    Supplementary Materials

    S1 File. Questionnaire.

    (DOCX)

    S2 File. CFA analysis result for assessing internal reliability.

    (DOCX)

    S3 File. Histogram and Q-Q plot for checking data distribution.

    (PDF)

    S1 Table. Participants’ socio-demographic distribution.

    (XLSX)

    S2 Table. ANOVA test for each demographic subgroup result.

    (XLSX)

    S3 Table. Chi-square test for assessing demographic differences among phases.

    (XLSX)

    Attachment

    Submitted filename: Covid_UK_Plos1.docx

    Attachment

    Submitted filename: Response to Reviewers.docx

    Attachment

    Submitted filename: Response to Reviewers.docx

    Attachment

    Submitted filename: Response to Reviewers.docx

    Data Availability Statement

    There are ethical restrictions related to participant confidentiality which prevent the public sharing of minimal data for this study. However, the minimal data are available upon request from University College London (UCL) Institute of Risk and Disaster Reduction (IRDR) Centre for Digital Public Health in Emergencies (dPHE) via email (irdr.dphe@ucl.ac.uk), or through their website (https://www.ucl.ac.uk/risk-disaster-reduction/ucl-irdr-centre-digital-public-health-emergencies-dphe), for researchers who meet the criteria for access to confidential data.


    Articles from PLOS ONE are provided here courtesy of PLOS

    RESOURCES