Abstract
Background
Psychological distress may exert a negative influence on reproductive function of couples at reproductive age. Couples seeking assisted reproductive technology (ART) treatment may have a higher prevalence of psychological distress than fertile couples. However, whether psychological distress is associated with the outcome of ART treatment remains unknown. We aimed to investigate the association of pre-treatment psychological distress and clinical pregnancy rate among infertility couples undergoing in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) treatment.
Methods
This nested case-control study was conducted based on women who underwent their first fresh IVF or ICSI cycle in the Jiangsu Birth Cohort Study (JBC) between November 2015 and January 2019. A total of 150 women who did not obtain clinical pregnancy after first IVF or ICSI fresh embryo transfer were identified as cases, and a total of 300 age matched women who obtained clinical pregnancy were identified as controls. Conditional logistic regression analyses were used to investigate the association between psychological distress and the outcome of first IVF or ICSI treatment, adjusting for multiple potential confounders.
Results
No statistically significant association was observed between score of maternal symptoms of psychological distress and clinical pregnancy. Adjusted ORs of logistic regression were 1.00 (95% CI 0.97-1.03) for anxiety, 0.98 (95% CI 0.95-1.02) for depression, and 0.98 (95% CI 0.95-1.01) for perceived stress, respectively. When treat depression and anxiety as categorical variables, 62 (13.8%) were classified as clinical depression, 11 (2.4%) were classified as clinical anxiety, among 450 women in the present study. Psychological distress symptoms were also not associated with clinical pregnancy rate. Adjusted ORs of logistic regression were 0.27 (95% CI 0.03-2.33) for anxiety, 0.88 (95% CI 0.46-1.68) for depression, respectively.
Conclusions
Our findings firstly indicated that psychological distress experienced prior to IVF/ICSI treatment was not associated with clinical pregnancy.
Supplementary Information
The online version contains supplementary material available at 10.1186/s12884-021-04202-9.
Keywords: Intracytoplasmic sperm injection (ICSI), In vitro fertilization (IVF), Psychological distress, Clinical pregnancy
Background
During the past few decades, assisted reproductive technology (ART) is widely practiced throughout the world. However, the rate of clinical pregnancy is still low [1]. Inadequate ovarian reserve [2], the presence of hydrosalpinx [3], uterine myoma [4], and endometriosis [5, 6] have been established as the main pathological factors, but the determinants of clinical pregnancy is still not fully revealed. Recently, many have shown that psychological distress may aggravate poor fertility [7, 8]. Pathways of the hypothalamic-pituitary adrenal axis or the hypothalamic-pituitary gonadal axis may play a key role in this regulation process [9–11]. Couples seeking ART treatment may have a higher prevalence of psychological distress than fertile couples [12], because of the permanency of infertility, loss of hope, the treatment itself, and several previous ART attempts [13–15]. Therefore, whether psychological distress is associated with the outcome of ART treatment has aroused widely concern.
Relationship between psychological distress and the outcome of ART treatment remains inconclusive [16–20]. Three studies have reported that psychological distress was associated with decreased pregnancy rates in in vitro fertilization (IVF) patients [16, 18, 21]. In contrast, a recent meta-analysis found that baseline (before ART treatment has started) psychological distress was not associated with ART outcome [22]. In addition, psychological distress covers a variety of symptoms [23, 24], but most previous studies only focused on single psychological distress [21, 25–28]. Furthermore, most of these studies only included IVF cycle data, and could not extend their findings to patients with intracytoplasmic sperm injection (ICSI) treatment [14, 16, 18, 21, 25, 29, 30]. Therefore, we conducted this nested case-control study based on a large prospective multicenter cohort in Chinese population, aimed to investigate the association of pre-treatment psychological distress and clinical pregnancy rate among infertility couples undergoing IVF or ICSI treatment.
Methods
Study population
We conducted this nested case-control study within the Jiangsu Birth Cohort Study (JBC), a prospective and longitudinal birth cohort study. The recruitment and assignment of JBC has been described in previous study [31]. Briefly, JBC recruited couples who were about to receive assisted reproduction at the Women’s Hospital of Nanjing Medical University or Suzhou Affiliated Hospital of Nanjing Medical University. They completed standardized and structured questionnaires by face-to-face interview to collect their demographic information. The JBC followed up both of assisted reproductive outcomes and obstetrics outcome using data from medical records and questionnaires. In this study, we identified women who underwent their first fresh IVF or ICSI cycle between November 2015 and January 2019. Women who have a history of three or more pregnancy losses were excluded from this study. A total of 150 women who did not obtain clinical pregnancy after first IVF or ICSI fresh embryo transfer were identified as cases, and a total of 300 age matched women who obtained clinical pregnancy were identified as controls. Clinical pregnancy was defined as the presence of one or more intrauterine gestational sacs with normal cardiac activity.
Cleavage-stage embryos were graded in three categories (Good, Fair and Poor) according to “ASEBIR embryo assessment criteria” [32], taking into account seven parameters (Day, Cell number, Fragmentation, Symmetry, Multi-nucleation, Vacuoles, Zona pellucida). Blastocysts were divided into three groups based on “consensus scoring system for blastocysts” [32], according to the stage of development, the morphologic grade of the inner cell mass and the trophectoderm: Good (1-6AA, 3-6AB, 3-6BA), Fair (3-6BB, 3-6 AC, 3-6CA, 1-2AB, 1-2BA), and Poor (1-6 BC, 1-6CB, 1-6CC, 1-2BB). Each grade is given a score (3 = good, 2 = fair, and 1 = poor) as the embryo score. The embryo scores of all transferred embryos are added together to obtain the embryo sum score.
The controlled ovarian hyperstimulation (COH) protocol was divided into three groups, including agonists protocol, antagonist protocol and other protocols, based on the usage of a gonadotropin-releasing hormone agonist (GnRH-a) versus antagonist analog. In the GnRH-a protocol, GnRH-a was used in the mid-luteal phase of the first menstrual cycle. Fourteen days later, exogenous gonadotropin (Gn), including FSH, luteinizing hormone (LH) and human menopausal gonadotropin (hMG) was used to promote ovulation when the pituitary reached the regulation standard. Human chorionic gonadotropin (HCG) was injected in the case of three or more follicles with a diameter of 16 ~ 18 mm and the oocytes were taken after 36 h. In the GnRH antagonist protocols, Gn was used on 2 ~ 3 days of the menstrual cycle. When the dominant follicle reached 12 ~ 14 mm or LH > 10 U/L, antagonists were used. HCG was injected when there were three or more follicles with diameters of 16 ~ 18 mm, and oocytes were taken after 36 h.
All methods and protocols for information collection were approved by the institutional review board of Nanjing Medical University, China NJMUIRB (2017) 002. The recruitment performed in accordance to the Helsinki declaration. Informed, written consent was obtained from all participants.
Psychological assessment
Psychological distress of couples including anxiety, depression and perceived stress were assessed before the assisted reproductive treatment. Anxiety was measured with the Self-Rating Anxiety Scale (SAS) [33]. The scale comprises 20 items covering autonomic, cognitive, motor, and central nervous systems symptoms. Each item is scored on a Likert scale ranging from 1 to 4 (1 = none or a little of the time, 2 = some of the time, 3 = good part of the time, 4 = most or all of the time). Participants with SAS standard scores ≥50 were considered at risk for clinical anxiety [34]. Depression was assessed using the Center for Epidemiologic Study of Depression Scale (CESD). The CESD consists of 20 items which are rated using a 4-point ordered response set to indicate how frequently symptoms were experienced during the previous week (0 = rarely or none of the time, 1 = some or a little of the time, 2 = occasionally or a moderate amount of the time, 3 = most or all of the time). Total score of CESD was generated by summing their item responses and ranging from 0 to 60 (higher scores indicating more depressive symptoms). Participants with CESD scores ≥16 were considered at risk for clinical depression [35]. Perceived stress was assessed with the Perceived Stress Scale (PSS-10), which consists of 10 items purported to measure the degree of nonspecific appraised stress over the past month [36]. Each item was rated using a 5-point ordered to indicate the frequently symptoms (0 = never, 1 = almost never, 2 = sometimes, 3 = fairly often, 4 = very often). The total PSS-10 score was ranging from 0 to 40, higher score represents greater stress [37].
Covariate information
We selected several potential confounders as covariates by reviewing the literatures [38–43]. Information on female body mass index (BMI), female educational attainment (< 12 years, ≥12 years), female occupation (mental worker, physical worker or none), household income (< 50,000 CNY, 50000 ~ 100,000 CNY, 100000 ~ 200,000 CNY, > 200,000 CNY), female and male smoking (none versus any), alcohol use (rarely: < 1 time/month; regular: ≥1 time/month), sleep quality (good versus poor), and exercise (rarely: < 3 times/week; regular: ≥3 times/week) before the start of treatment were retrieved from the questionnaire data. Infertility factor (female factor, male factor, couple’s factor, and unexplained factor), duration of infertility, and prior history of pregnancy loss (nulliparous, gravid with no prior history of loss, gravid with prior history of loss) were retrieved from medical records. Sleep quality was assessed by the Pittsburgh Sleep Quality Index (PSQI) developed by Buysse et al. [44]. It is a self-rated questionnaire and disturbances over an l-month time interval while higher scores represent worse sleep quality [44]. We used the established cutoff > 5 to depict poor sleep quality [44, 45].
Statistical analysis
Non-normally distributed variables were reported as the median (25th-75th range) and were compared using the Mann-Whitney U test among groups. Nominal variables were tested either with the Chi-square test or Fisher’s exact test. Conditional logistic regression was used to estimate ORs with 95% CIs to assess the association between pre-treatment psychological distress and clinical pregnancy. All statistical analyses were performed using the R software version 4.0.2 (http://www.R-project.org/). P < 0.05 was considered statistically significant.
Results
As shown in Table 1, a total of 150 cases of women that failed to obtained clinical pregnancy and 300 controls of women that obtained clinical pregnancy were included in this study. The age was adequately matched between cases and controls (P > 0.05). Similar distributions of other baseline characteristics were also observed between cases and controls. Infertility factors were not associated to the clinical pregnancy (Supplementary Table 1).
Table 1.
Characteristics of the study population (N = 450 women) undergoing their first recorded fresh IVF or ICSI cycle
| Covariate | Pregnancy N = 300 | Non-pregnancy N = 150 | P |
|---|---|---|---|
| Age at first cyclea | 31.0 (29.0, 33.0) | 31.0 (29.0, 34.0) | 0.123c |
| BMI before transfer, kg/m2, No. (%) | |||
| < 18.5 | 19 (6.3) | 9 (6.0) | 0.954e |
| 18.5 ≤ BMI < 24 | 210 (70.0) | 102 (68.0) | |
| 24 ≤ BMI < 28 | 58 (19.3) | 32 (21.3) | |
| BMI ≥ 28 | 13 (4.3) | 7 (4.7) | |
| Annual Household Income, 10,000 CNY, No. (%) | |||
| < 5 | 12 (4.0) | 7 (4.7) | 0.423e |
| 5 ~ 10 | 77 (25.7) | 48 (32.0) | |
| 10 ~ 20 | 118 (39.3) | 49 (32.7) | |
| > 20 | 93 (31.0) | 46 (30.7) | |
| Occupation (%) | |||
| Mental worker | 150 (50.0) | 73 (48.7) | 0.831d |
| Physical worker | 135 (45.0) | 71 (47.3) | |
| No | 15 (5.0) | 6 (4.0) | |
| Education, year, No. (%) | |||
| ≥ 12 | 218 (72.7) | 103 (68.7) | 0.439d |
| < 12 | 82 (27.3) | 47 (31.3) | |
| Prior history of pregnancy loss (%) | |||
| Gravid, with no prior history of loss | 12 (4.0) | 8 (5.3) | 0.508e |
| Gravid, with prior history of loss | 14 (4.7) | 10 (6.7) | |
| Nulliparous | 274 (91.3) | 132 (88.0) | |
| Sleep quality (%)b | |||
| Good | 228 (77.6) | 124 (85.5) | 0.065d |
| Poor | 66 (22.4) | 21 (14.5) | |
| Infertility factor (%) | |||
| Couple’s factor | 181 (60.3) | 99 (66.0) | 0.399e |
| Female factor | 98 (32.7) | 46 (30.7) | |
| Male factor | 19 (6.3) | 5 (3.3) | |
| Unexplained factor | 2 (0.7) | 0 (0.0) | |
| Duration of infertility (m) | 36.0 (24.0, 53.0) | 36.0 (24.0, 60.0) | 0.683c |
| Smoking before transfer, No. (%) | |||
| Non-smoker | 297 (99.0) | 147 (98.0) | 0.405e |
| Smoker | 3 (1.0) | 3 (2.0) | |
| Alcohol use before transfer, No. (%) | |||
| Rarely | 292 (97.3) | 148 (98.7) | 0.507e |
| Regular | 8 (2.7) | 2 (1.3) | |
| Exercise, No. (%) | |||
| Rarely | 249 (83.0) | 124 (82.7) | 1.000d |
| Regular | 51 (17.0) | 26 (17.3) | |
Values are number of women (%) for categorical variables, median and range for continuous variables unless indicated otherwise
aCases and controls were matched on female age
bVariable contains missing data
cP values were derived with Mann–Whitney U test for nonnormally distributed continuous variables
dP values were derived with Pearson chi-square test for categorical variables
eP values were derived with Fisher exact test for categorical variables with less than 10 observations per category
Clinical pregnant women shown similar median score compared with non-pregnant women (SAS score of women: 31.0 versus 32.0 points, P = 0.761; CESD score of women: 6.0 versus 5.5 points, P = 0.387; PSS score of women: 11.0 versus 10.0 points, P = 0.208). Among their partners, there were no differences in the median anxiety, depression and perceived stress levels between the two groups. Partners of pregnant women also have a similar median score compared with those of non-pregnant women (SAS score of partners: 28.0 versus 28.0 points, P = 0.859; CESD score of partners: 4.0 versus 4.0 points, P = 0.674; PSS score of partners: 10.0 versus 9.0 points, P = 0.463). Pregnant couples did have a similar median score compared with non-pregnant couples (SAS score of couples: 61.0 versus 61.0 points, P = 0.91; CESD score of couples: 12.0 versus 11.0 points, P = 0.685; PSS score of couples: 20.5 versus 20.0 points, P = 0.165). Logistic regression analyses showed that continuous pre-treatment psychological distress score were not associated with clinical pregnancy outcome of the first fresh cycle (Table 2). Adjusted ORs of were 1.00 (95% CI 0.97-1.03) for anxiety, 0.98 (95% CI 0.95-1.02) for depression, and 0.98 (95% CI 0.95-1.01) for perceived stress, respectively. Similar associations were observed in their partners and in couples (Table 2).
Table 2.
Conditional logistic Regression Analysis of psychological distress level on pregnancy rate of first IVF or ICSI cycle among 450 couples
| Psychological distress | Pregnancy | Non-pregnancy | Pa | Crude ORb (95% CI) | Adjusted ORc (95% CI) | Adjusted ORd (95%CI) |
|---|---|---|---|---|---|---|
| Woman | ||||||
| Anxiety | 31.0 (26.0, 36.3) | 32.0 (26.0, 37.0) | 0.761 | 1.00 (0.97-1.03) | 1.00 (0.97-1.03) | 1.00 (0.97-1.03) |
| Depression | 6.0 (1.8, 12.0) | 5.5 (1.0, 11.0) | 0.387 | 0.98 (0.95-1.01) | 0.98 (0.95-1.01) | 0.98 (0.95-1.02) |
| Perceived stress | 11.0 (4.0, 15.0) | 10.0 (2.0, 14.0) | 0.208 | 0.98 (0.95-1.01) | 0.98 (0.95-1.01) | 0.98 (0.95-1.01) |
| Partner e | ||||||
| Anxiety | 28.0 (25.0, 33.0) | 28.0 (25.0, 33.0) | 0.859 | 0.99 (0.95-1.02) | 0.98 (0.95-1.01) | 0.98 (0.95-1.02) |
| Depression | 4.0 (0.0, 9.0) | 4.0 (0.0, 10.0) | 0.674 | 1.00 (0.97-1.02) | 0.99 (0.96-1.02) | 0.99 (0.96-1.03) |
| Perceived stress | 10.0 (3.0, 14.0) | 9.0 (1.5, 15.0) | 0.463 | 0.99 (0.96-1.02) | 0.98 (0.95-1.01) | 0.99 (0.96-1.02) |
| Couple e | ||||||
| Anxiety | 61.0 (53.0, 68.0) | 61.0 (53.0, 68.0) | 0.910 | 0.99 (0.97-1.01) | 0.99 (0.97-1.01) | 0.99 (0.97-1.01) |
| Depression | 12.0 (3.0, 20.0) | 11.0 (3.0, 20.8) | 0.685 | 0.99 (0.97-1.01) | 0.99 (0.97-1.00) | 0.99 (0.97-1.01) |
| Perceived stress | 20.5 (8.0, 29.0) | 20.0 (6.0, 27.0) | 0.165 | 0.99 (0.97-1.00) | 0.98 (0.97-1.00) | 0.99 (0.97-1.01) |
Values are median and range for continuous variables unless indicated otherwise
aP values were derived with Mann–Whitney U test for nonnormally distributed continuous variables
bUnivariable conditional logistic regression analyses of psychological distress level on pregnancy rate of first IVF or ICSI cycle
cModel 1: Multivariable conditional logistic regression analyses were adjusted for female pre-treatment BMI, educational attainment, occupation, household income, infertility factor, duration of infertility
dModel 2: Multivariable conditional logistic regression analyses were adjusted for female pre-treatment BMI, educational attainment, occupation, household income, infertility factor, duration of infertility, prior history of pregnancy loss, alcohol use, sleep quality, exercise, female and male smoking before the start of treatment
eVariable contains missing data
When treat depression and anxiety as categorical variables, 62 (13.8%) were classified as clinical depression, 11 (2.4%) were classified as clinical anxiety, among 450 women in the present study. Psychological distress symptoms were also not associated with clinical pregnancy rate. Adjusted ORs of logistic regression were 0.27 (95% CI 0.03-2.33) for anxiety, 0.88 (95% CI 0.46-1.68) for depression, respectively. Furthermore, using women without any psychological symptom (neither depression nor anxiety) as a reference, the ORs for were 0.95 (95% CI 0.49-1.84) for those who exposed to one symptom (anxiety or depression), and 0.29 (95% CI 0.03-2.63) for two symptoms (anxiety and depression), respectively (Table 3).
Table 3.
Conditional logistic Regression Analysis of psychological distress symptoms on pregnancy rate of first IVF or ICSI cycle among 450 women
| Psychological distress | N | No. of non-pregnancy (%) | Crude ORa (95%CI) | Adjusted ORb (95%CI) | Adjusted ORc (95%CI) |
|---|---|---|---|---|---|
| Anxiety | |||||
| No | 439 | 148 (33.7) | 1.00 | 1.00 | 1.00 |
| Yes | 11 | 2 (18.2) | 0.44 (0.10-2.06) | 0.46 (0.10-2.20) | 0.27 (0.03-2.33) |
| Depression | |||||
| No | 388 | 129 (33.2) | 1.00 | 1.00 | 1.00 |
| Yes | 62 | 21 (33.9) | 1.03 (0.57-1.85) | 0.93 (0.51-1.70) | 0.88 (0.46-1.68) |
| Psychological distressd | |||||
| Norm | 387 | 129 (33.3) | 1.00 | 1.00 | 1.00 |
| One symptom (Depression/Anxiety) | 53 | 19 (35.8) | 1.11 (0.60-2.06) | 0.99 (0.53-1.85) | 0.95 (0.49-1.84) |
| Two symptoms (Depression and Anxiety) | 10 | 2 (20.0) | 0.51 (0.11-2.42) | 0.52 (0.11-2.54) | 0.29 (0.03-2.63) |
aUnivariable conditional logistic regression analyses of psychological distress level on pregnancy rate of first IVF or ICSI cycle
bModel 1: Multivariable conditional logistic regression analyses were adjusted for female pre-treatment BMI, educational attainment, occupation, household income, infertility factor, duration of infertility
cModel 2: Multivariable conditional logistic regression analyses were adjusted for female pre-treatment BMI, educational attainment, occupation, household income, infertility factor, duration of infertility, prior history of pregnancy loss, alcohol use, sleep quality, exercise, female and male smoking before the start of treatment
dNorm was defined as women without any symptom including depression, anxiety. One symptom was defined as women with any symptom including depression or anxiety. Two symptoms were defined as women with depression and anxiety
Discussion
In this nested case-control study, we found that psychological distress before IVF or ICSI treatment, in general or as specific types, were not associated with clinical pregnancy in infertile couples during the first fresh cycle. This study is the first one to evaluate the effect of pre-pregnancy depression, anxiety, or stress individually and comprehensively on the clinical pregnancy probability among IVF/ICSI treated women of infertility in the Chinese population.
Our finding was supported by several recent studies [14, 26–29, 46–48]. Three prospective studies of the literature on stress and IVF outcome had concluded that stress in women, before or during treatment, was not correlated with pregnancy outcome [26–28]. Concerning to depression and anxiety, four prospective studies had concluded that no association between pre-treatment depression/anxiety in women and pregnancy outcome [14, 29, 46, 48]. In addition, only one study in Chinese population (264 IVF or ICSI women) had explored depression, anxiety and stress simultaneously, which reported that women’s stress, anxiety, and depression were unlikely have correlation with clinical pregnancy [29]. Given most of previous studies only focused on single aspect of psychological distress and lack of control for potential confounders, our study provided more reliable evidence for the association.
Some studies showed that psychological distress predicted a higher rate of poor outcomes [25, 49–51]. However, there were several limitations should be concerned. First, most of the former studies did not included women with only first-time fresh IVF or ICSI. Because, women’s emotional experiences might be affected by previous experience of ART treatment [13, 14, 52, 53]. Second, few studies used multidimensional evaluation of psychological distress of in infertile couples. Third, a majority of studies couldn’t were failed to fully control for potential confounding factors for the association, such as lifestyle factors, duration and cause of infertility, pregnancy history [38–40, 42, 54, 55]. Furthermore, sleep quality was not taken into consideration in previous studies [56–58].
The main strengths of our study include the prospective cohort based nested case-control design and standard assessments conducted separately in two Chinese ART clinics. In addition, our data are available to adjust for potential confounders such as causes of infertility and important lifestyle factors. Some limitations should be also noted. First, although our perceived psychological scales were simultaneously administered before treatment, but single time point limited us to comprehensively evaluate the psychological influence on outcome of ART treatment. Second, the data of psychotherapy or psychopharmacological treatments was not available, thus we could not control the potential confounding on our findings. Third, our sample size is slightly larger than two existing literature in China [27, 29], but still might be inadequate to detect relatively small effects. In addition, we included unequal groups (150 cases versus 300 controls) in our study, which may lead to additional bias [59]. Therefore, validation study with larger sample size is warranted in the future.
Conclusion
In summary, our study on psychological distress and IVF or ICSI outcome did not observed significant influence of pre-treatment psychological distress (e.g., anxiety or depression) on the rate of clinical pregnancy. Further, women are still encouraged to express psychological distress before treatment and the development of intervention strategies to improve coping are helpful, not only toward reducing emotional suffering, but also to avoid discontinuing treatment before reaching goal of live birth.
Supplementary Information
Additional file 1: Supplementary Table 1. Characteristics of the ART procedures among 450 couples undergoing their first recorded fresh IVF or ICSI cycle. Supplementary Table 2. Conditional logistic Regression Analysis of psychological distress level on pregnancy rate of first IVF or ICSI cycle among couples without endometriosis, or chronic endometritis or autoimmune disorders. Supplementary Table 3. Conditional logistic Regression Analysis of psychological distress symptoms on pregnancy rate of first IVF or ICSI cycle among women without endometriosis, or chronic endometritis or autoimmune disorders. Supplementary Figure 1. Flowchart for inclusion and exclusion of the study population.
Acknowledgments
The authors thank all of medics in Reproductive Medicine Center of the Affiliated Nanjing Maternity and Child Health Hospital of Nanjing Medical University and Reproductive Medicine Center of the Affiliated Changzhou Maternity and Child Health Care Hospital of Nanjing Medical University for recording all the data in this study through the years.
Authors’ contributions
M. P., M.W., and H.L. had the idea and developed the hypothesis for this manuscript. M.W., J.D., and G.J. drafted and revised the manuscript. T.C., X.L., H.L., Q.M., B.H., B.X., X.H., K.Z., J.C., and T.J. collected and checked the data. Y.J., M.P., M.W., S.T., L.H., C.L., X.X., Q.L., X.L., and Y.L. performed the data management and the statistical analyses. c, H.M., Y.X., F.C., G.J., Z.H., and H.S. controlled the research quality. Z.H. and H.S. obtained funding for this cohort study. All authors reviewed and approved the paper.
Funding
This study was supported in part by National Key Research & Development Program (2018YFC1004200, 2016YFC1000200).
Availability of data and materials
The datasets during and/or analyzed during the current study available from the corresponding author on reasonable request.
Declarations
Ethics approval and consent to participate
All methods were carried out in accordance with relevant guidelines and regulations under Ethics approval and consent to participate. All procedures were approved by the institutional review board of Nanjing Medical University, China NJMUIRB (2017) 002. All participants provided written informed consent prior to participation.
Consent for publication
Not applicable.
Competing interests
The authors declare no conflict of interest.
Footnotes
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Meijuan Peng, Mingyang Wen and Tao Jiang contributed equally to this work.
Contributor Information
Jiangbo Du, Email: dujiangbo@njmu.edu.cn.
Guangfu Jin, Email: guangfujin@njmu.edu.cn.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
Additional file 1: Supplementary Table 1. Characteristics of the ART procedures among 450 couples undergoing their first recorded fresh IVF or ICSI cycle. Supplementary Table 2. Conditional logistic Regression Analysis of psychological distress level on pregnancy rate of first IVF or ICSI cycle among couples without endometriosis, or chronic endometritis or autoimmune disorders. Supplementary Table 3. Conditional logistic Regression Analysis of psychological distress symptoms on pregnancy rate of first IVF or ICSI cycle among women without endometriosis, or chronic endometritis or autoimmune disorders. Supplementary Figure 1. Flowchart for inclusion and exclusion of the study population.
Data Availability Statement
The datasets during and/or analyzed during the current study available from the corresponding author on reasonable request.