Abstract
Introduction
Neonatal sepsis is a systemic infection occurring in infants during the first 4 weeks of life and is a major cause of mortality and morbidities of newborns due to their age-related weak and immature immune systems. In Ethiopia, despite many studies being conducted on neonatal sepsis, the reported findings are inconsistent. The aim of this study is to determine the prevalence of neonatal sepsis to enhance the utility and interpretation of the evidence.
Methods
An extensive systematic review and meta-analysis were performed to extract studies on the prevalence of neonatal sepsis in Ethiopia. The PubMed, Cochrane Library, ScienceDirect, Web of Science, and Google Scholar were systematically searched. Two independent authors selected and extracted the data from each included article. The heterogeneity of included studies was assessed using the Higgins I2 test, and a random-effects model was performed in Stata/se Version 14.
Results
Eighteen studies with a sample size of 10,495 study subjects were included with a reported range of neonatal sepsis from 17% to 78%. The pooled prevalence of neonatal sepsis was 45% (95% CI: 35, 55; I2 = 99.3%, p < 0.01). Early onset neonatal sepsis was found to have a prevalence of 75.4% (95% CI: 68.3, 82.6). Subgroup analysis in the study area (i.e., by region) was calculated revealing the highest neonatal sepsis in Amhara region at 64.4% (95% CI: 44.9, 84.0) and the lowest in Southern Nations, Nationality, and People at 28% (95% CI: 16, 40).
Conclusion
In this review, the prevalence of neonatal sepsis in Ethiopia was found to be high, especially in terms of early onset neonatal sepsis. As a result of the findings, it is important to consider the early and optimal points for interventions to better manage the prevalence and outcomes of neonatal sepsis. Further research is needed to investigate the neonatal sepsis status at different regions and associated factors for neonatal sepsis not yet studied.
1. Introduction
The neonatal period is the most vulnerable time for children's survival. Globally every year about 4 million children die in the first 4 weeks of life, of which 99% of the deaths occur in low- and middle-income countries and of which 75% are considered avoidable [1]. Even though neonatal mortality shows a declining trend over the last 20 years from 50.6 per 1000 live births in 1998 to 28.9 per 1000 live births in 2017 [2], Ethiopia continuous to struggle with a prevalence of about 42% or 81,000 newborn deaths every year [1]. Thus, neonatal sepsis is a major cause of neonatal mortality due to a higher risk of infection because of their weak and immature immune systems related to their age [3, 4].
Neonatal sepsis is a systemic infection occurring in infants at the first 4 weeks of life which can be classified as either early or late onset sepsis [1, 5]. Clinical signs and symptoms of sepsis in newborns vary by gestational age and severity of infection. It is more common for a septic infant to be hypothermic upon presentation [6]. Among all major causes of neonatal deaths, sepsis accounts for 25% of all neonatal deaths in sub-Saharan Africa and southern Asia [7]. Even though there are some improvements to access essential preventive, primary child health care services and sector training [1], neonatal sepsis is still the major cause of newborn deaths resulting in more than one-third of all neonatal deaths [1, 8].
To date, there are inconsistent findings and no systematic review and meta-analysis have been done to enhance the quality and consistency of the evidence. Therefore, the aim of this study was to consider the evidence to determine the prevalence of neonatal sepsis in Ethiopia while serving as a baseline for clinicians and policy makers to design future infrastructure and system strengthening to improve the quality of health.
2. Methods
2.1. Search Strategy
To locate potential articles, PubMed, Google Scholar, Cochrane Library, Web of Science, and ScienceDirect were comprehensively searched between January 27 and June 3, 2019. We extended our search by reviewing reference lists of eligible articles, hand searching for grey literature, and other important literature collections including the Addis Ababa Digital Library and Saint Mary's University repositories. The search protocol was formulated by using common keywords: prevalence AND associated factors AND pediatrics OR infant OR newborn OR neonate's sepsis AND Ethiopia (MeSH Terms). The data selection of this systematic review was presented according to the preferred reporting items for systematic reviews and meta-analysis (PRISMA) guidelines [9]. However, it was not registered on the prospective registration of systematic review and meta-analysis (PROSPERO), which is addressed in Limitations of the Study.
2.2. Eligibility
Included articles were both published and unpublished full text observational study designs reporting the prevalence of neonatal sepsis in Ethiopia, whereas case reports, national reports, clinical studies, and reviews were excluded.
2.3. Outcome Variables
Neonatal sepsis is the main outcome of the study and calculated as the total number of sepsis cases divided by the total number of live birth infants in the study multiplied by 100. Neonatal sepsis can be classified as early onset sepsis acquired from birth to 7 days and late onset sepsis acquired after delivery in the normal newborn nursery, the neonatal intensive care unit, or the community (8 to 30 days). Thus, meta-analysis was performed for two or more studies reporting the same outcomes [10].
2.4. Data Selection and Extraction
Two independent reviewers (SA and YL) screened the downloaded articles and extracted all necessary data from included articles; discussions and mutual consensus were used when discrepancies arose. The extraction format included primary author, study design, classification of sepsis onset, data source, health facility, study area/region, study period, publication year, quality score, sample size, and prevalence with 95% confidence interval.
2.5. Quality Assessment and Appraisal
We had performed a critical appraisal of the research evidence to assess the methodological quality of a study to determine the extent to which a study has addressed the possibility of bias in its design, conduct, and analysis using a standardized data appraisal format adapted from the Joanna Briggs Institute (JBI) checklist [11].
Moreover, to assess the quality of each primary study, the Newcastle-Ottawa Scale (NOS) for cross-sectional studies was adopted [12]. The tool has three main components and uses a star grading system. The first component has possible five stars and considers the credibility on the selection of study groups. The second section of the tool deals with the comparability of the groups with a possibility of two stars. The third section of the grading system focuses on the ascertainment for either exposure or outcome of each original study with a possibility of three stars to be assessed. In addition, quality appraisal of included studies was evaluated by two authors (MA and LY) independently and any discrepancy was resolved by a third author (MAA). Articles with a NOS score of ≥5 stars out of 10 were considered as high quality [13] for the purposes of our work (Supplementary Table).
2.6. Risk of Bias Assessment
The risk of bias assessment of included articles was evaluated by two authors (LY and SA) independently using the Hoy et al. (2012) adapted tool for prevalence studies which consists of 10 items addressing four domains of bias plus a summary risk of bias assessment [14]. Any discrepancy was resolved by discussion and mutual consensus mediated by a third author (MAA).
2.7. Data Processing and Analysis
Data were extracted in a Microsoft™ Excel spreadsheet, and analysis was carried out using Stata/se Version 14 statistical software. Heterogeneity among reported prevalence was assessed by computing p values of Higgins's I2 statistics; I2 was considered as significant at a p value < 0.10 [15]. The DerSimonian and Laird's random-effects meta-analysis model was used to determine the pooled effect size, since the true effect is not the same in all studies [16].
We deal heterogeneity with subgroup analysis, metaregression, and sensitivity analysis. Subgroup analysis was done based on study settings. In addition, an effort to understand the sources of heterogeneity, univariate metaregression analysis was conducted for sample size, publication year, study design, quality score, and midyear study period. Metaregression was used instead of subgroup analyses since it allowed for the use of continuous covariates and permitted the inclusion of more than one covariate at a time. Moreover, sensitivity analysis was computed to assess the influence of a single study on the pooled estimates.
A forest plot was used to describe pooled prevalence with 95% confidence intervals. The size of each box indicated the weight of the study, while each crossed line refers to a 95% confidence interval with the mean effect at the center. The possibility of publication bias was assessed visually with funnel plots, and the objectivity test of Egger's test with p value less than 0.05 was considered evidence of publication bias.
3. Results
3.1. Study Selection
We followed the PRISMA guideline to present the findings of this review. We extracted 1167 articles regarding neonatal sepsis using PubMed, Google Scholar, Cochrane Library, Web of Science, and ScienceDirect. After removing duplicates, 236 articles were screened of which 119 were excluded after reading the title and abstracts. The remaining 117 full text articles were assessed for eligibility. Eighteen studies met the eligibility criteria and were included in the final analysis, as shown in the chart of study selection process (Figure 1).
3.2. Descriptive Summary of Included Neonatal Sepsis Articles
As described in Table 1, these 18 studies were cross-sectional and cohort study designs published between March 2005 and March 18, 2019, along with selected grey literature. In the current systematic review and meta-analysis, 10,495 neonates were included. The sample size by study ranged from 169 in Tikur Anbesa Specialized Hospital (TASH), Addis Ababa [17], to 3418 in Dilchora Referral Hospital (DRH), Dire Dawa City Administration [18]. The prevalence of neonatal sepsis reported was between 22% in Karamara General Hospital (KGH), Somalia region [19], and 78% in Shashemene Referral Hospital (SRH), Oromia region [20].
Table 1.
Authorship (reference) | Study period | Publication (yr) | Study design | Facility name | Study area (region) | Source of data | Sample | Early onset sepsis | Late onset sepsis | Prevalence (95% CI) |
---|---|---|---|---|---|---|---|---|---|---|
Woldehanna and Idejene [21] | 1/9/1994–31/8/1999 | 2005 | Retrospective | GTH | Gondar (Amhara) | Chart review | 330 | NA | NA | 75 (70, 80) |
Tewabe et al. [22] | 30/4/16-30/5/2016 | 2018 | Retrospective | FHRH | Bahir Dar (Amhara) | Chart review | 410 | NA | NA | 24 (20, 28) |
Farah et al. [19] | 8/2014-2017 | 2018 | Retrospective | KGH | Karamara (Somalia) | Char review | 792 | NA | NA | 22 (19, 25) |
Kokeb and Desta [23] | 1/1/2014- 31/3/2014 | 2016 | Cross-sectional | GTH | Gondar (Amhara) | Primary | 325 | NA | NA | 78 (73, 82) |
Yismaw and Tarekegn [24] | 1/2016–3/2018 | 2018 | Retrospective | GTH | Gondar (Amhara) | Chart review | 516 | NA | NA | 78 (74, 81) |
Sorsa et al. [25] | 4/2016–5/2017 | 2019 | Cross-sectional | ATH | Asela (Oromia) | Primary | 902 | NA | NA | 33 (30, 36) |
Ketema et al. [26] | 9-10,2017 | 2019 | Retrospective | JGH | Jinka (SNNP) | Chart review | 335 | NA | NA | 33 (28,39) |
Roba and Diro [18] | 1/1/2013-10/1/2017 | 2017 | Retrospective | DRH | Dire Dawa | Chart review | 3418 | NA | NA | 35 (34, 37) |
Woldu et al. [27] | 15/4/2014-15/10/2014 | 2014 | Cross-sectional | BGH | Bishoftu (Oromia) | Primary | 306 | 81 | 19 | 72 (67, 77) |
Serbesa and Iffa [28] | 2–5,2017 | 2019 | Cross-sectional | ARH | Mekelle (Tigray) | Primary | 301 | 65.1 | 34.9 | 23 (18, 28) |
Mersha et al. [29] | 22/4/2018-29/6/2018 | 2019 | Cross-sectional | WSTH & SCH | Wolaita (SNNP) | Primary | 275 | 66.5 | 34.5 | 34 (28, 39) |
Getabelew et al. [20] | 2/2016-2/2017 | 2018 | Cross-sectional | SRH and MGH | Shashemene (Oromia) | Primary | 244 | 65 | 35 | 78 (73, 83) |
Demisse et al. [30] | 1/12/2015–31/8/2016 | 2017 | Retrospective | GTH | Gondar (Amhara) | Chart review | 769 | 87.7 | 12.3 | 68 (65, 71) |
Mengistie et al. [31] | 1-2/2018 | 2018 | Cross-sectional | HTH & AGH | Hawassa (SNNP) | Primary | 402 | 80.9 | 19.1 | 62 (57, 68) |
Alemu [32] | 9/2016 2/2017 | 2017 | Retrospective | TASH | Addis Ababa | Chart review | 304 | 80 | 20 | 17 (13, 21) |
Bayana et al. [33] | 1/1/2016-31/12/2017 | 2018 | Retrospective | JTH | Jimma (Oromia) | Chart review | 341 | NA | NA | 20 (16, 25) |
Gudeta [34] | 11/8/2014-1/11/2016 | 2017 | Retrospective | TASH | Addis Ababa | Chart review | 356 | NA | NA | 19 (15, 23) |
Getachew [17] | 11/2017-7/2018 | 2018 | Cross-sectional | TASH | Addis Ababa | Primary | 169 | NA | NA | 40 (32, 47) |
MGH = Melkaoda General Hospital; WSTH = Wolaita Sodo Teaching Hospital; SCH = Sodo Christian Hospital; HTH = Hawassa Teaching Hospital; AGR = Adare General Hospital; ARH = Ayder Referral Hospital; BGH = Bishoftu General Hospital; FHRH = Felege Hiwot Referral Hospital; ATH = Asela Teaching Hospital; JGH = Jinka General Hospital; JTH = Jimma Teaching Hospital.
3.3. Prevalence of Neonatal Sepsis in Ethiopia
Prevalence of neonatal sepsis was found to be 45% (95% CI: 35, 55; I2 = 99.3%, p < 0.01) which indicates high heterogeneity (Figure 2). Hence, subgroup analysis, based on the study regions, was computed and did not show a significant level of difference/heterogeneity for neonatal sepsis. The highest prevalence was found in Amhara region to be 64% (95% CI: 45, 84), followed by the Oromia region at 51% (95% CI: 24, 77), whereas the lowest prevalence was found in Southern Nations, Nationality, and People at 28% (95 CI: 16, 40) (Figure 3).
Among the included studies, seven of the studies reported neonatal sepsis as early and late onset neonatal sepsis classification. Thus, early onset neonatal sepsis was reported in the range of 65% SRH, Oromia, and 88% in Gondar Teaching Hospital (GTH), Amhara. Thus, we found 75.4% (95% CI: 68.3, 82.6) pooled early onset neonatal sepsis (Figure 4).
In addition, univariate metaregression analysis was conducted to identify possible sources of heterogeneity for midyear study period, publication year, quality score, and sample size. Again, all of these covariates were found to be statistically nonsignificant (Table 2).
Table 2.
Variables | Coefficient | p value |
---|---|---|
Sample size | -0.0000 | 0.62 |
Publication year | -0.0342 | 0.053 |
Quality score | -0.0055 | 0.97 |
Midyear study period | -0.0177 | 0.15 |
Moreover, sensitivity analysis was computed to evaluate whether the exclusion of any single study altered the magnitude or statistical results of the summary estimate. None of the studies influenced the summary pooled estimates (Figure 5).
Publication bias was assessed by a funnel plot and absence of bias was represented by substantial symmetry (Figure 6). To confirm the absence of publication bias, Egger's test was employed and did not show the presence of bias (p = 0.627).
4. Discussion
Neonates are at a higher risk of infection because of their developmentally weak and immature immune systems. In this study, the pooled prevalence of neonatal sepsis for Ethiopia was found to be 45%, while early onset neonatal sepsis acquired before or during delivery accounted for 75.4%.
This study revealed that pooled prevalence of neonatal sepsis in Ethiopia is consistent with the findings from Cameroon (37.9%) [35], Tanzania (38.9%) [36], and Egypt (45%) [37]. However, our finding is higher than previous studies reported in Iran (18.4%) [38], Mexico (4.3%) [39], and Egypt (8.6%) [40]. This variation could be due to unique cultural features of the population, local obstetrics and neonatal practices, socioeconomic and sexual practice, hygiene, and nutritional differences over settings [41] as well as due to clinical features for sepsis identification, study methodology, and sample size difference which we observed during our study.
The subgroup analysis of neonatal sepsis studies based on region of the country found 64% (95% CI: 45, 84) in Amhara region where studies were from specialized hospital chart review followed by the Oromia region at 51% (95% CI: 24, 77), whereas the lowest was observed in Southern Nations, Nationality, and People at 28%(95% CI: 16, 40) primary study at district hospital. The possible explanation for this variation could be due to the differences in health facility, study design, and sample size variation across studies.
4.1. Limitations of the Study
A number of the studies included in this review had a relatively small sample size which may decrease the power of the study. Secondly, there are studies only from five regions and two city administrations of Ethiopia, which restrict the representativeness of the study. This study also emphasized only the prevalence of neonatal sepsis. In addition, this study is not registered in PROSPERO which could compromise transparency and credibility of the study.
5. Conclusion
In this review, the prevalence of neonatal sepsis in Ethiopia was found to be high, especially in terms of early onset neonatal sepsis. As a result of the findings, it is important to consider the timing and optimal points for interventions to better manage the occurrence of neonatal sepsis. Further research is needed to investigate the neonatal sepsis status at different regions not yet studied and associated factors for neonatal sepsis.
Acknowledgments
The authors of the primary study is acknowledged.
Data Availability
Minimal data can be accessed upon request from first author.
Conflicts of Interest
The authors declare that they have no competing interests.
Authors' Contributions
MAA helped in the conception of research protocol, study design, literature review, data extraction, data analysis, interpretation, and drafting the manuscript. MA contributed on data extraction, quality assessment, data analysis, and manuscript review. LY contributed on data extraction, quality assessment, data analysis, interpretation, and manuscript review. DBK helped in the study design, data analysis, editing, and manuscript review. YL contributed on study design, literature review, data extraction, data analysis, interpretation, and manuscript review. SA helped in the conception of research protocol and study design and contributed on data extraction, quality assessment, data analysis, and manuscript review. PMP contributed on critically review, editing, and validating the research and manuscript content. All authors read and approved of the final manuscript.
Supplementary Materials
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
Data Availability Statement
Minimal data can be accessed upon request from first author.