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Wasting and its associated factors among under-two years children in Ethiopia: a systematic review and meta-analysis

BMC Public Health volume 24, Article number: 2547 (2024) Cite this article

Abstract

Introduction

Globally, about 45 million under-five children have suffered from wasting where Asian and African countries have the major share of these wasted children. Despite wasting is affected all types of populations, the long and short term effect is more severe and sensitive in under-two aged children. Hence, this review was intended to assess pooled prevalence and associated factors of wasting among under-two children in Ethiopia.

Methods

The search was done using electronic data bases (Hinari, PubMed, Google scholar, Scopus) and research repositories from June 19–22/2023. The review included articles published between January 2013 and December 2023.The study included Cross-sectional/case control studies which report the prevalence and associated factors of wasting in under-two aged children. The quality of included studies was assessed using the Joanna Briggs Institute (JBI) quality assessment checklists for observational studies. The presence of heterogeneity between included studies was evaluated using Cochrane Q-test and the I2 statistics. Publication bias was checked through graphical and statistical test. Associated factors were estimated by random effect model using DerSimonian-Laird model weight.

Results

The pooled prevalence of wasting among under-two children was 10.91% (95% CI: 8.97–12.85; I2 = 86.36%). Absence of maternal antenatal follow up (OR; 3.23: 95%CI: 1.20–5.26), no exclusive breast feeding until six months (OR; 5.30; 95%CI: 1.17–9.43), current illness of the child (OR; 2.58: 95%CI: 1.78–3.37), large family size (OR; 12.38; 95%CI: 1.37–26.13) and low wealth status of the households (OR; 3.91; 95%CI: 1. 54-8.36) were significant factors of wasting among under-two children.

Conclusions

This study disclosed that the pooled prevalence of wasting among under- two children were high in Ethiopia. Absence of maternal antenatal follow up, no exclusive breast feeding, low wealth status of the households, large family size and current illness of the child were significant factors of wasting. Strictly adherence of maternal antenatal follow up, counsel the parents to feed only breast milk until six months, limit the number of family size to the level of the household income and early treatment of the sick child were recommended. Furthermore, scale up the wealth status and living standard of the family can address the agenda of reducing and eradicating all forms of malnutrition. This review registered at PROSPERO with registration number CRD42023414914 (https://www.crd.york.ac.uk/prospero/#myprospero).

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Introduction

Malnutrition is still continues as a major public health problem throughout the globe that affects almost every country [1]. Undernutrition (wasting, stunting and underweight) is a particular and alarming public health concern in low and middle-income countries [2]. Wasting is a measure of acute undernutrition and represents the failure to receive adequate nutrition within short period of time [3]. It is defined as weight-for-height <-2 standard deviation (moderate wasting) or <-3standard deviation(severe wasting/ severe acute malnutrition) median of the WHO Child growth standards [4].

Childhood wasting is high risk of morbidity and mortality .It results in negative consequence of development in young children [5, 6] which is caused by an inadequate amount or quality of food and repeated infections [7].Wasted children have impaired immunity system to fight against infectious agents which leads to increased severity, duration, and susceptibility to infectious diseases that increases the risk of death [8, 9]. Evidences indicated that the risk of mortality among wasted children were ten times higher than well-nourished children [6]. Moreover, children with wasting are exposed for long term developmental delay [10], , poor cognition and learning performance, short adult stature, lower productivity, and chronic disease in the adulthood [11].

Globally, in 2022 about 45 million under-five children were suffered from wasting. Of which 13.7 million children were affected by severe wasting. Asian and African countries were a home to these severe wasted children [3]. It causes 1 in five deaths of children worldwide [12]. Evidence from 94 low and middle-income countries also revealed that the prevalence of wasting in under- two years children was 14% [13]. The pooled evidence of 32 Sub-Saharan African countries also disclosed that the prevalence of wasting among children age 6–23 months was 9.4% [14]. According to 2019 Ethiopia demographic and health survey (EDHS), the prevalence of wasted children in Ethiopia was 7% with the highest prevalence in Somali region (21%) [15].

Although wasting is affected all types of populations, the long and short term effect is more severe and sensitive in under-two aged children [16]. Because, it is a time frame/window of opportunity at which children undergo fast growth and development, susceptible to infection, and are in need of adequate and balanced nutrition [17]. Lack of required nutrition during this critical time prone the child for: growth flattering [18], concurrent wasting and stunting, compromised neurocognitive development, weakened immunity system, increase the risk of premature death in many folds [19]. The Contributing factors of wasting in under-two years children were: lack of exclusive breast feeding, inadequate food diversity [20], prelactal feeding, removal of colostrum, maternal education status [21], poor wealth index, rural settings [22], age of child (below 12 months), child with current history of diarrhea, no maternal nutrition counseling during pregnancy [23].

Currently, the world has planned and implemented several strategies like; Sustainable Development Goals (SDGs) in collaborating with World health Assembly (WHA) [24], Global Action Plan on Child Wasting [25] and USAID Multi-Sectoral Nutrition Strategy [26] to reduce the prevalence of child wasting to less than 5% by 2025 and further reduce the prevalence to less than 3% by 2030. Ethiopia also has planned and carried out similar strategies [27] to reach national and international targets of alleviating and eliminating this wide spread corrosive public health problem. Despite these targets were adopted and implemented, the recent evidence disclosed that the prevalence of wasting among children are still remain high [28].

In Ethiopia several studies has been conducted to assess the prevalence of wasting among under-two children and appeared in a fragment and inconclusive way ranging from 4.7% in Addis Ababa [29] to 17.5% in Somali region [30] respectively. In addition, the factors contributing to wasting also presented inconsistently in these studies [29, 31]. Therefore, the aim of this review was to determine the pooled national evidence of wasting among children during their window of opportunity and its associated factors. The finding of this study will help to address the national as well as international targets of reducing childhood wasting.

Methods

Prospero registration

The study protocol of this review was registered at the International Prospective Register of Systematic Reviews (PROSPERO) and can be accessed with a registration number of CRD42023414914.

Search strategy

The search was done comprehensively using electronic data bases like; Hinari, PubMed, Google scholar, Scopus and open Google. Unpublished works were also retrieved from research centers and university repositories. The search was conducted from June 19–22/2023. Reference lists of relevant papers were also searched to include any other potentially significant articles. The following keywords, search terms/MeSH headings were utilized to build a comprehensive search strategy which combined by Boolean operators “AND” “OR”:

“Prevalence“[Mesh] OR “magnitude” OR “proportion” OR “burden” OR “epidemiology” AND “Risk Factors“[Mesh] OR “predictors” OR “associated factors” OR “etiology” AND “severe acute malnutrition“[Mesh] OR “nutritional status“[Mesh] OR “acute malnutrition” OR “under nutrition” OR “acute under nutrition” AND “children 6–23 months” OR “under two years ” OR “infants and young child*”OR “children less than 2 years” OR” young child*”OR “children 6–24 months” AND Ethiopia (Table S1).

The authors were used the context; Population, Intervention, Comparison and Outcome (PICO) search format of prevalence studies to include all relevant papers.

  • Participants/populations: children aged less than two years and whose weight/height < -2Zscore.

  • Intervention/exposure group: under two years children with wasting.

  • Comparison/comparator: well-nourished children.

  • Outcome of interest: prevalence of wasting among children less than two years.

Inclusion and exclusion criteria

Cross-sectional and case control studies which report the prevalence and associated factors of wasting in under-two aged children were included. Papers with no full texts, case series, case reports, qualitative studies and articles published other than English languages were excluded. Only Cross-sectional studies were used to calculate pooled prevalence.

Measurement of outcome variables

The study has two main outcomes: The first is estimating the pooled prevalence of wasting among under-two children and the second to determine its associated factors. The pooled prevalence of wasting was determined using the adjusted odds ratios (AOR) reported from primary studies.

Study selection and quality assessment

All the relevant studies retrieved through electronic data base were reviewed independently by two reviewers (MA and BC). Version 8 Endnote software was used to exported, combined and removed duplicated studies. Full-text articles were downloaded using Endnote software and manually. AK and SZ assessed the quality of included studies using the Joanna Briggs Institute (JBI) quality assessment checklists for observational studies. Studies whose quality score is above 50% was considered as high quality. Based on this, all the included articles had 75% JBI quality assessments score (S2 checklist).

Data extraction and management

Data extraction is carried out from relevant studies by two authors independently (AK and MCA). The disparity between two authors was resolved through discussion and by the third author (MA). For each included articles; first author name, publication year, study region, study design, study setting, sample size, prevalence, associated factors effect size and standard error were extracted on Microsoft excel spread sheet.

Data analysis

After the data were extracted on Microsoft excel, exported to STATA version 17 software for analysis. The pooled estimate of wasting among under-two aged children and its associated factors were estimated by random effect model using DerSimonian-Laird model weight. The presence of heterogeneity between included studies was assessed using Cochrane Q-test and the I2 statistics. Sub-group analysis was done to adjust random variation in the presence of significant heterogeneity between primary studies. Moreover, the presence of publication bias was checked through graphical (funnel plot) and statistical (Egger’s) test.

Results

Study selection and identification

Of 1,050 total articles obtained from different electronic data bases, 398 duplicate studies were removed. And again 764 articles were removed as they are not relevant for this systematic review and meta-analysis. Reading the full title and abstract, 501 studies were excluding and after evaluating full text articles, 150 reports were retrieved. Again, 71 studies were assessed for eligibility. Finally, 14 studies were included for analysis after removal of 57 studies with reasons (Fig. 1).

Fig. 1
figure 1

PRISMA flow diagram of studies selection for systematic review and meta-analysis of the prevalence of wasting among under-two children its determinants in Ethiopia

Full size image

Study characteristics

This review included the total sample of 7,815 participants where the smallest sample size from Amhara region (201) [20] and the largest is from EDHS (2146) [32]. The study has included articles published between 2013 and 2023. Twelve cross-sectional [29,30,31,32,33,34,35,36,37,38,39,40] and two case control [20, 41] studies were incorporated. Among these studies, five of them were conducted in Oromia region [35, 38,39,40,41], four in Amhara region [20, 33, 34, 38] and one study in Somali region (Table 1).

Table 1 Characteristics of included studies and their prevalence of wasting among children age less than years in Ethiopia
Full size table

Prevalence of wasting among under-two years children in Ethiopia

Using random effects model, the pooled prevalence of wasting among under-two children was 10.91% (95% CI: 8.97–12.85). Significant heterogeneity was observed between studies (I2 = 86.36%, P-value < 0.001). Sahiledengle et al. [32]and Worku et al. [29] had the highest weight respectively and Fekadu et al. [30] has the lowest weight (Fig. 2).

Fig. 2
figure 2

Forest plot for pooled prevalence of wasting among under-two years children in Ethiopia

Full size image

Small study effect

Publication bias was checked by using funnel plot and Egger’s statistical test. Accordingly, from visual inspection, there is symmetrical distribution of studies (Fig. S1). Egger’s statistical test also showed that there is absence of small study effect among studies (p-value = 0.9468).

Investigation of heterogeneity

This meta-analysis exhibited a considerable heterogeneity among studies from random effects model. Therefore, to identify the possible sources of heterogeneity, sensitivity and sub-group analysis were conducted.

Sensitivity analysis

Leave one out analysis was performed to investigate the influence of single study on the overall effect size estimate. Since the overall pooled estimate (10.91) is included within the confidence interval of all included studies, it is declared that there is no single study that significantly influences the overall effect size estimate (Fig. S2).

Sub-group analysis

Sub-group analysis was done based on the study year, region, sample size and residence.

The pooled prevalence of wasting among under-two children was higher in studies conducted before 2019 (12.93%; 95%CI: 9.85–16.01, I2 = 81.38%, p < 0.001) as compared to studies done after 2019 (9.54%; 95%CI: 7.31–11.78, I2 = 84.74%, p < 0.001) (Fig. 3).

Fig. 3
figure 3

Subgroup analysis by study year for prevalence of wasting among under-two children in Ethiopia

Full size image

From regional sub-group analysis, the highest prevalence of wasting among under-two children was observed in Amhara region (12.12%; 95%CI: 6.91–17.33; I2 = 89.86%, p < 0.001) followed by Oromia (11.36%; 95% CI: 9.33–13.40; I2 = 54.03%, p < 0.001) (Fig. S3).

The result of sub-group analysis by sample size showed that the prevalence of child wasting among studies with sample size < 600(11.14%; 95%CI: 8.54–13.75, I2 = 86.54%, p < 0.001) was higher than sample size greater than ≥ 600 (10.42%; 95%CI: 6.93–13.92, I2 = 88.89%, p < 0.001) (Fig. S4). Furthermore, the pooled estimate of wasting among under-two children was higher among studies performed in rural settings (11.88%; 95%CI: 9.60-13.99, I2 = 77.27%, p < 0.001) (Fig. S5).

Factors associated with wasting among under-two children in Ethiopia

As shown in Table 2, number of family size, wealth quartile, and maternal antenatal follow up, recent history of child illness and exclusive breast feeding until six months were significant factors of child wasting.

Table 2 The pooled estimate of factors associated with wasting among under-two years children in Ethiopia
Full size table

The relation between history of child illness and wasting was assessed by four studies [30, 34, 40, 41]. Children with recent history of illness were 2.58 times more likely to be wasted compared to their counterparts (OR; 2.58: 95%CI: 1.78–3.37) (Fig. 4).

Fig. 4
figure 4

Forest plot indicating the association between wasting and child illness

Full size image

The pooled estimate of three studies [20, 31, 37] showed that children from family size greater than five were more likely to become wasting compared to with number of family size less than five(OR; 12.38: 95%CI:1.37–26.13). In meta-analysis of two studies [39, 40], children born from mothers with no antenatal follow up were 3.23 times more likely to develop wasting (OR; 3.23: 95%CI:1.20–5.26).

The pooled result of two [35, 40] studies revealed that low wealth status of the household has 3.9 time odds to develop childhood wasting as compared to highest wealth status(OR; 3.91: 95%CI:1.54–8.36). Exclusive breast feeding until six month has significant association to child wasting. Children who did not get exclusive breast feeding were 5.3 times odds to develop wasting than children who exclusive breast fed (OR; 5.30; 95%CI: 1.17–9.43) (Table 2).

Five studies [30,31,32, 34, 40] used to determine the association of maternal education status and childhood wasting. The pooled result depicted that there is no association between maternal educational status and wasting among children less than 2 years (OR; 1.51; 95%CI: 0.97–2.05).

The pooled results of three studies [32, 33, 36] showed that age of the child and wasting has no statistical association (OR; 1.33; 95%CI: 0.41–2.26). In addition, the association of child wasting and having latrine assessed in this study [20, 33, 41] and the result revealed that there is no statistical association between presence of latrine and childhood wasting (OR; 1.59: 95%CI; 0.39–3.56).

Discussion

Despite international and national unreserved interventions, wasting in children is still being continued with its devastating results particularly in under-two aged children.

Hence, the purpose of this review was to assess the pooled prevalence of wasting among under-two aged children during their window of opportunity and its associated factors.

The finding of this review disclosed that pooled prevalence of wasting among under-two children was 10.91% (95% CI: 8.97–12.85). This is similar with the studies done in Bangladesh and Uganda [42, 43], but the result is lower than the finding in Sohag Governorate, Nepal, Burkina Faso and India [44,45,46,47].The evidence from this review is also higher than the study conducted in China and Gahanna [48, 49]. This variability is justified by differences in study setting, socio-demographic and economic characteristics, time of study done and sample size. In addition, wasting in low income countries is more prevalent due to resource scarcity and poor delivery system [13].

Regarding sub-group analysis, the pooled prevalence of wasting among under-two children was higher among studies conducted before 2019 (12.93%) as compared to studies done after 2019(9.54%). This is because of Ethiopia is one of the countries who has been adapted and implemented sustainable development goal strategies to work on reducing childhood undernutrition [50] by 2030, though implementation of Seqota declaration [27] and national nutrition program [1]. Sub-group analysis based on the setting also showed that the pooled estimate of wasting among under-two children was higher among studies performed in rural settings (11.88%) as compared to children from urban settings (8.01%).This is in line with the study conducted in Sub-Saharan Africa [51] and in Papua New Guinea [52].This disparities might be due to maternal education status, access to safe drinking water and sanitation, limited access to professional education regarding to importance of optimal child feeding [53]. In contrast, the recent study of South Asia disclosed that children from urban settlement were more risk of being wasted than children from rural area [54]. Furthermore, from regional sub-group analysis, the highest prevalence of wasting among under-two children was observed in Amhara region (12.12%) followed by Oromia (11.36%).

Our review has shown that large number of family size (> five) has strong association with increasing childhood wasting. This is supported by previous studies in China [55], and Ethiopia [56]. As the number of family size increase within the household, the provision of adequate nutrition will be under question in resource limited settings due to financial constraints [57]. Other evidence from this review depicted that child with recent history of illness was associated with wasting as supported in other investigations ( [46, 58]. This is reasoned by illness such as pneumonia, diarrhea or other infections prone the children to loss of appetite and reduced the required amount of daily food intake, breast feeding and malabsorption which leads to wasting [59, 60]. In addition, undernutrion and infections are complex and bi-directional in nature that means; malnutrition cause infection by decreasing the immune system that fight against disease and infection also exposed the child for malnutrition/ wasting by experiencing decreased appetite, malabsorption, increasing nutrient requirements and compromised child nutritional status [61].

Children born from mothers with no antenatal follow up were more likely to develop wasting which is congruent with the previous studies [62, 63]. Antenatal care has great a contribution to have healthy and well-nourished children because the mothers would have a chance to get advice and counseling about the importance of both maternal and child nutrition during early life of child growth and development [63]. The study also revealed that poor wealth status of the family has 3.9 times odds of developing childhood wasting as compared to highest wealth status. This is in line with the previous studies [64,65,66]. Children from poor households primarily faced lack of fundamental daily nutrients which is basic for their growth and development. Most importantly, children from these families were prone for inadequate and insufficient food supply, inappropriate care, low living standard, unable to keep proper hygiene and sanitation, and also exposed for acute and chronic illness that [64, 67].

Moreover, our review disclosed that children who exclusively breast fed (EBF) were more odds to develop acute malnutrition/wasting than children who exclusive breast fed which is supported by the study conducted in Bangladesh and India [68, 69]. It is obvious that exclusively breast feeding of children until six months has tremendous impact on their normal growth and development due to its invaluable nutritional value and prevention of infection by scale upping the immunity system [70, 71]. Evidences showed that infants who EBF until six months were saved from diarrhea, pneumonia and other acute respiratory infections [68, 72, 73] which are the main cause of childhood undernutrition/wasting [74].

Study strength and limitations

This review is the first in kind that is conducted in Ethiopia and provided updated and conclusive evidence of childhood wasting and its determinants among children during window of opportunity. Sub-group analysis was attempted to minimize significant heterogeneity. Despite these strengths, the study has considerable limitations that the reader should appreciate. The review has significant heterogeneity and it included only quantitative studies. Articles written in languages other than English were also excluded.

Conclusion

This study disclosed that the pooled prevalence of wasting among under- two children were unexpectedly high in Ethiopia. Absence of maternal antenatal follow up, no exclusive breast feeding until six months, low wealth status of the households, large family size and current illness of the child were significant factors of wasting. Based on the finding, we recommended that strictly adherence of antenatal follow up, counsel the mother to feed only breast milk until six months. In addition, limit the number of family size to the level of the household income and early treatment of sick child before getting worse and cause severe acute malnutrition. Furthermore, scale up the wealth status and living standard of the family can alleviate the problem and address the agenda of reducing and eradicating all forms of malnutrition.

Data availability

The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.

Abbreviations

SDGs:

Sustainable Development Goals

EDHS:

Ethiopia Demographic and Health Survey

WHA:

World Health Assembly

USAID:

United States Aid International Development

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Acknowledgements

We are grateful to acknowledge Bahir Dar University for allowing internet services to conduct this Review. We also extend our thanks to the authors of included articles in this systematic review and meta-analysis.

Funding

This research did not receive any specific fund.

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Authors and Affiliations

  1. Department of Pediatrics and Child Health Nursing, College of Health Sciences, Debre Tabor University, P.O.Box:272, Debre Tabor, Ethiopia

    Amare Kassaw, Demewoz Kefale & Fikadie Dagnew Baye

  2. Department of Epidemiology and Biostatics, Institute of Public Health, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia

    Muluken Chanie Agimas & Getaneh Awoke

  3. Department of Adult Health Nursing, College of Health Sciences, Debre Tabor University, Debre Tabor, Ethiopia

    Shegaw Zeleke & Tigabu Munye Aytenew

  4. Department of Pediatrics and Child Health Nursing, College of Health Sciences, Wolkite University, Wolkite, Ethiopia

    Bogale Chekole

  5. Department of Maternal and Neonatal Health Nursing, College of Health Sciences, Debre Tabor University, Debre Tabor, Ethiopia

    Worku Necho Asferie

  6. Department of Pediatrics and Child Health Nursing, College of Health Sciences, Woldia University, Woldia, Ethiopia

    Biruk Beletew & Molla Azmeraw

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  1. Amare Kassaw
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Contributions

AK involved in conceptualization, data curation, investigation, supervision, software, resource allocation and methodology. SZ assessed the quality if included studies. DK played his role in data extraction and methodology. FDB, MCA, SZ, GA, TMA, BC, WNA, BB and MA played their role in critically revising the proposal, participated in its design, analyzed and interpreting the results and wrote the manuscript. All authors were involved in reading and approving the final manuscript.

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Correspondence to Amare Kassaw.

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Kassaw, A., Kefale, D., Baye, F.D. et al. Wasting and its associated factors among under-two years children in Ethiopia: a systematic review and meta-analysis. BMC Public Health 24, 2547 (2024). https://doi.org/10.1186/s12889-024-20063-1

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ISSN: 1471-2458

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