- Research article
- Open Access
- Open Peer Review
Predictors of acute undernutrition among children aged 6 to 36 months in east rural Ethiopia: a community based nested case - control study
© Egata et al.; licensee BioMed Central Ltd. 2014
- Received: 3 July 2013
- Accepted: 28 March 2014
- Published: 4 April 2014
Child undernutrition is one of the major public health problems in the developing countries having a devastating effect on the lives of many children under five years of age. However, its causes are multitude and not uniformly understood enough across the various parts of the world and that a thorough understanding of these causes is required to design appropriate intervention. The objective of this study was to identify the predictors of acute child undernutrition in east rural Ethiopia.
An unmatched community based nested case -control study was carried on 2199 (241 cases and 1958 controls) cohorts of children aged between 6–36 months with their respective mothers from July/August, 2010 to January/ February, 2011. The data were collected by using a pre-tested structured questionnaire and anthropometric measuring instruments which are recommended by UNICEF, after the standardization. Odds Ratio along with 95% confidence interval was estimated to identify determinants of wasting using the multivariable logistic regression.
Wasting was associated with poor [AOR (95% CI) = 1.49 (1.02, 2.20)] and middle [AOR (95% CI) = 1.52 (1.05, 2.20)] households’ socio-economic positions , individual based decision - making on the care or treatment of the ill child [AOR (95% CI) = 1.62 (1.20 ,2.20)], lack of maternal access to health facility [AOR (95% CI) = 1.56 (1.14, 2.20)], narrow birth interval [AOR (95% CI) = 1.65 (1.23, 2.20)], and non - exclusive breast feeding [AOR (95% CI) = 1.43 (1.05, 1.94)].
Wasting was significantly associated with the households’ poverty, poor access to health services, lack of mutual decision – making on the care or treatment of their sick child between biological parents, closer birth interval, and poor exclusive breastfeeding practice. Thus, an organized effort should be made at all levels to improve infant and young child feeding , health services, child birth spacing behavior, and exclusive breastfeeding practice of the poor rural population particularly mothers to curb the problems of child undernutrition.
- Under five children
Acute child undernutrition is one of the major public health problems in the developing world claiming the lives of many children under five years of age. In this setting, the problem is pervasive and about 55 to 60 million of these children are wasted [1–3]. The magnitude of wasting is substantial and persistent in the Sub-Saharan Africa (SSA)  including Ethiopia where many children under-five are suffering from the effects of child undernutrition [5–9]. Evidence showed that child undernutrition is responsible for 54% of the deaths of children under five years of age (nearly 11 million children) globally [10, 11] and for 51% of the deaths of Ethiopian children in the same age category [6, 7, 12].
Malnutrition encompasses both undernutrition and overnutrition [10, 13]. Undernutrition, which results from inadequate intake of energy and other important nutrients, is often used interchangeably with malnutrition in many literatures [10, 14, 15].
In cognizant of the consequences of child undernutrition, it is important to understand its risk factors at different levels in the given society as they are multitude and hierarchically interrelated and not uniformly understood across the various regions of the world. Thus, a thorough understanding of these factors is required for a better intervention. In this regard, the United Nations Children’s Emergency Fund (UNICEF), in its malnutrition conceptual framework and other related literatures, identified three major risk factors that could lead to child undernutrition, namely, basic or structural, underlying (behavioral), and immediate (biological) risk factors [14, 16].
Globally different literatures revealed that household (socio-economic and demographic) factors such as household’s poverty and income [4, 17–19], residence, occupation [20–22], education [20, 22, 23], maternal age , family size and violence [20, 21, 25], overcrowding , lack of exposure to mass media [20, 22, 26, 27], and non – use of iodized salt [22, 28] have influenced the occurrence of acute child undernutrition. Concomitantly, some behavioral or community factors including lack of maternal and child health services, of adequate and safe water supply, and of improved environmental sanitation play their role [22, 29].
Moreover, maternal undernutrition [2, 21, 24, 27], narrow birth interval , child related factors such as child’s gender , age [22, 27, 30, 31], weight at birth [20, 21, 23, 24, 27], and hospitalization [1, 22, 27, 32], improper delivery of child health services, and poor Infant and Young Child Feeding practices (IYCF) [19–22] have been identified as proximate (individual) level risk factors for child wasting. There are some evidence that wasting was not associated with any of the IYCF [31, 33, 34] and the household food security status [35–37]. However, these results indicate the complexity of the problems at hand.
Although there is persistently high magnitude of acute child undernutrition in Ethiopia, available studies do not provide sufficient evidence on its risk factors at all corners of the country. In these studies, it was reported that child wasting was associated with some household factors such as family income and rural residence while community level factors included only the poor household sanitary facilities. On the other hand, maternal undernutrition and child related factors such as gender, low birth weight, and lack of appropriate IYCF were identified as the individual level factors [6–9, 12, 38]. However, most of these surveys were conducted on less sufficient number of study participants and used cross-sectional designs which are not appropriate to identify risk factors. Thus, this study was conducted to identify predictors of acute undernutrition among children aged 6 to 36 months in the rural east Ethiopia.
This study was conducted in Kersa Demographic Surveillance and Health Research Centre (KDS-HRC) of Haramaya University, east Ethiopia. There were 48,192 adults and 7, 198 children under five years of age, living in 10256 households of the Demographic Surveillance Site (DSS). Most of these adults were illiterate and farmers . The DSS is located in Kersa District which was divided into two semi-urban and ten rural ‘kebeles (the smallest administrative units in Ethiopia), and has three climatic zones-low land, midland and highland. In the district, there were no hospital and ambulance service and the nearest hospital was 50 km from the research site. However, there were three health centers and ten community health posts in the DSS. Each community health post had two health extension or community health workers who provide basic primary health care services. The primary health care coverage of the district was 80% in 2010 [40, 41].
Agriculture is the main livelihood of most of the population of the DSS. Crop production is basically on annual basis, except in few locations where it is biannual. Sorghum and maize are the common grains cultivated in the district. Some potato and other vegetables are also scarcely produced. Crops that are good for family subsistence often planted during the wet season (June-August) and harvested in the dry season (December–February), while khat, a stimulant plant with amphetamine like effects, is predominantly produced as a cash crop. Polygamy is a very common in the area, and there are no profound cultural taboos related to IYCF .
Study design and participants
A community based nested case-control study was conducted in the DSS from July/August 2010 to January/February 2011. A total of 2,352 mother–child pairs were enrolled into the follow - up study to determine the seasonal variation in the prevalence of acute child under-nutrition out of which 118 mother–child pairs did not complete their follow–up making a loss to follow up rate of 5%. However, among mother–child pairs who completed their follow-up, only 2,199 had plausible anthropometric measurements while the measurements of 35 children showed a flag sign beyond the standard range of values .
For the purpose of the follow-up study, the households in each kebele were enrolled into the follow-up using simple random sampling from the already available sampling frame of the KDS-HRC proportional to their estimated under five population size calculated from the total adult population of each kebele. In Ethiopia, the estimated proportion of the under five population is nearly 15% of the adult population .
Baseline survey was conducted on the randomly selected 2, 352 mother-child pairs from each selected household and the prevalence of acute child undernutrition was determined in wet season. The samples were drawn from the randomly selected households in each study kebele/village of the DSS proportional to the maximum sample size allocated for the study. If more than one 6 to 36 months of age children lived in the selected household, one child was selected by lottery method. The same mother–child pairs were then followed for 6–8 months. The population for this particular study consisted of sampled cases and controls of children 6 to 36 months of age and their mothers (mother–child pairs) who have been followed over the aforementioned period of time. The nutritional status of these children was again determined at the end line of the study in dry season when the available cases of under nutrition and the corresponding controls were identified. All cases and controls, who had credible anthropometric measurements within normal range of values for a weight-for-height z-score (WHZ) were included in the analysis regardless of the estimated sample size for this study to address other exposure variables of the study and increase the power of the study. In this study, cases of acute undernutrition (wasted children) were defined as the children whose WHZ - score was less than or equal to −2 standard deviation (SD) while the controls were those with greater than -2 SD score based on the existing evidence [14, 44, 45].
The sample size was computed using STATCALC application of Epi -Info 3.5.1 Statistical software with the following assumptions: proportion of illiteracy among the mothers of the controls to be 66.1% and of the cases 75 .0% , 5% type I error, 90.0% power of the study, control to case ratio of 4: 1 to detect an odds ratio of 1.54  with a 20% contingency for none response. The exposure variable was educational attainment of women in the study setting . Thus, the minimum sample size required for the study was 2,160 (540 cases and 1620 controls). However, as the number of cases identified at the end line of the study was less than the required sample size, all 2,199 (241 cases and 1.958 controls) children who had appropriate anthropometric data and their mothers were considered in this study.
The data were collected by using a structured and pretested interview questionnaire and anthropometric measurements. The questionnaire was initially prepared in English and then has been translated into the local language, Afan Oromo, by fluent speakers of both languages and again it was translated back into English to check its consistency. Data collectors and supervisors were obtained from KDS-HRC and the surrounding community. Both categories received intensive training for one week on the questionnaire and interviewing and anthropometric measurement techniques .Data collectors were paired during the data collection to ensure quality of the data. Anthropometric measurements were been taken after the proper training and standardizing procedures. A UNICEF recommended measuring and weighing instruments were used to collect the anthropometric data. Children below 24 months of age were measured in a recumbent position, while standing height was measured for those who were 24 months and older. Anthropometric measurements were taken twice and a difference of 100 gram in weight and 0.1 cm in length was accepted as normal. However, repeated measurement was carried out upon significantly larger differences . Children were also assessed for the presence or absence of edema of the feet. Anthropometric data were calculated by using WHO Anthro2010 software and WHZ- scores were also been generated based on the WHO child growth standards which was introduced recently in 2006 .
The outcome variable was the nutritional status of the children selected for the study. In this study, the risk factors of child undernutrition were examined in the context of conceptual framework that was adopted from UNICEF’s malnutrition conceptual framework. This was done by organizing the explanatory variables into basic (household), community (underlying), and proximate (individual) level risk factors. The household factors included parents’ education, decision making strategy if the child is ill, wealth index and food security status. Maternal access to health facility and tetanus toxoid vaccination during the last pregnancy were considered as community factors, while individual factors included child’s characteristics such as age, sex, utilization of separate feeding plate, and minimum dietary diversity that was eaten by the children 24 hours preceding the survey, maternal birth interval, and exclusive breastfeeding.
Decision-making strategy by biological parents about care of their sick child was categorized as ‘individually made decision’ and ‘commonly/jointly made decision. The former is coded 0 while the latter coded 1. Individually made decision’ is a decision made by either the father or the mother alone. Such a decision making trait would be common when both parents of the child are not living together or could not reach consensus even while living together. Similarly, the household’s socio-economic status (wealth index) was assessed by using 28 variables. These variables included income, possession of durable assets, and cooperative bank saving account, sanitation facilities, source of drinking water, and housing conditions [6, 7]. Regarding this, Principal Component Analysis (PCA) was computed to determine the households’ socio- economic position or wealth index. The categorical variables were made dummy before initiating the analysis, but the ordinal ones were ordered from the least important to the most important one . Finally, the households were grouped into three: poor, middle, and rich and coded 1, 2, and 3, respectively.
The food security status of the households was determined based on nine standard Household Food Insecurity Access Scale (HFIAS) questions that were developed for this purpose by Food and Nutrition Technical Assistance (FANTA) in 2007. The respondents were asked about the amount and variety of meal eaten, and the occurrence of food shortage for the household members, causing them not to eat the whole day or eat at night only, in the past four weeks preceding the survey . All “Yes” responses were coded as’ one and “No” responses were coded as zero, and the responses were summed to produce an index of household food insecurity. The index had a high internal consistency (Cronbach’s alpha = 0.90) . Later on, food secure households were coded “1” and food insecure ones “0” for further analysis.
Furthermore, maternal access to health facility was categorized as “yes” and coded “1” and as “no” and coded “0”. In this study, access to health care facility was based on a proxy report of mothers to their main source of health care services, and the report of key informants in the respective kebeles of the study setting. It was also indicated that according to the principle of primary health care, accessibility refers to the availability of health care facilities for the clients within 10 km radius. It was also taken into account while determining access to health facility .
In this study, EBF was understood as feeding only breast milk without anything else for the first six months of life, with the exception of medicines for therapeutic purpose . Minimum dietary diversity was defined as the proportion of children who were fed foods from 4 or more food items out of the seven major foods items within 24 hours preceding the survey . It was categorized into two: ‘dietary intake from less than 4 major food items which was coded 0 and 4 or more major food items which was coded 1 .
The study was cleared by the Ethical Review Committee of Haramaya University, College of Health and Medical Sciences, Ethiopia. Informed verbal and written consents were obtained from the parents/care givers of the children before the interview. Illiterate mothers consented by their thumb print after verbal consent.
Data management and analysis
The data were double entered onto EPI- Data Version 3.1 by independent data clerk and were exported to SPSS Version 16. Multicollinearity was tested among the independent variables by using the Variance Inflation Factor (VIF) and the tolerance test. The result of the VIF ranges from 1.005–1.215 while the tolerance test was less than one, which was within the normal limit . The factors that were supposed to interact were identified and entered together into the model in pairs and the interaction was checked at P < 0.05 significant level. Nevertheless, there was no interaction between the variables.
A bivariate analysis was performed on the independent variables and their proportions and crude odds ratio were computed against the outcome variable to identify the factors that are associated with acute child undernutrition. Then, three independent logistic regression models were constructed based on the knowledge of UNICEF’s malnutrition conceptual framework [16, 52]. Each model was constructed based on the goodness of fit test and model coefficients tests. Thus, the Hosmer–Lemeshow goodness-of-fit and Omnibus tests of model coefficients with enter procedure were used to test for the model fitness. The variables that showed an association with the outcome variable at the bivariate analysis were put into the three hierarchical models and all the variables with p value ≤ 0.2 were entered into the final multivariable logistic regression model. However, the known determinants of child undernutrition such as a child’s sex and age, and the practice of EBF were entered into the model regardless of the p value. Odds ratio along with 95% confidence interval was estimated to assess the strength of the association and a P value < 0.05 was used to declare the statistical significance in the multivariable analysis.
Socio – demographic and economic characteristics of the study participants by nutritional status, Kersa district, east Ethiopia, 2011
Sex of household head
Relationship with a child
Maternal age (years)
Mean age (± standard deviation)
Decision - making strategy of the sick child
Household’s socio-economic position (SEP)
Child’s age (months)(N
Mean age (± standard deviation)
In the bivariate analysis, children who had illiterate mothers [COR(95% CI) = 2.00 (1. 20, 3.33)] and fathers [COR(95% CI) =1.64 (1.21, 2.21)], families in the poor [COR(95% CI) = 1.66 (1.18, 2.33)] and middle [COR(95% CI) =1.43 (1.008, 2.02)] socio-economic status, and who do not practice joint decision-making on the care of the sick child [COR(95% CI) = 1.70 (1.25, 2.17)] were more likely to be acutely undernourished at household level.
Correspondingly, children of mothers who had no access to the health facilities [COR(95% CI) = 1.74 (1.32, 2.28)] and TT vaccination during their last pregnancy [COR(95% CI) = 2.0 (1.06, 1.83 )] were at risk of undernutrition.
Bivariate analysis of selected characteristics of the study participants, Kersa district, east Ethiopia, 2011
COR (95% CI)
Decision - making strategy of the sick child
Household’s wealth index
Households’ food security
Maternal access to health facility
Maternal TT vaccination
Exclusive breast feeding
< 2 years
≥ 2 years
Child had separate feeding plate
MDD 24 hours before the survey
< 4 food items
≥ 4 food items
Child’s age (months)
Household, community, and individual level predictors of acute under nutrition among children 6 – 36 months, Kersa district, east Ethiopia
Model I AOR (95% CI)
Model II AOR (95% CI)
Model III AOR (95% CI)
Final model AOR (95% CI)
Household (basic) factors
Decision - making strategy of the sick child
Households’ wealth index
Household food security
Community (underlying) factors
Maternal access to health facility
1.56(1.14, 2.20 )**
Maternal TT vaccination
Individual (proximate) factors
1,22 ( 0.92, 163)
1.43(1.05 , 1.9 4)*
1.62(1.22, 2.20 )**
1.65 (1.23, 2.20)**
≥ 2 years
Child had separate feeding plate
MDD 24 hours before the survey
< 4 food items
≥ 4 food items
Child’s age (months)
In the final multivariable model, children from households with poor [AOR (95% CI) =1.49 (1.02, 2.20)] and middle [AOR (95% CI) =1.52 (1.05, 2.20)] socio-economic status were nearly twice at increased risk of wasting. Similarly children whose parents did not make joint decision on the treatment of the sick child [AOR (95% CI ) = 1.62 (1.20, 2.20)], mothers lack access to health facilities [AOR (95% CI) = 156 (1.14, 2.20] and have narrow birth interval [AOR (95% CI) = 1.65 (1.23, 2.20)] were nearly twice more likely to be wasted. Non - exclusive breastfeeding [AOR (95% CI) = 1.43 (1.05, 1.94)] was also significantly associated with child wasting (Table 3).
In this study, acute undernutrition among the cohort of children, was associated with poor and middle households socio-economic positions, individually made decision strategy on the treatment/care of the sick child, lack of maternal access to health facilities, narrow birth interval, and non-exclusive breast feeding.
Among household factors, the households’ socio-economic status and lack of joint decision-making strategy on the care or treatment of the sick child have significantly affected children’s nutritional status. Based on the extensively reviewed literatures, in this study the role of parental decision making pattern was found to be the first of its kind in affecting acute child undernutrition. The odds of acute undernutrition were higher among children from families who made decision individually on the care or treatment of their sick children compared with the children whose families have made decision jointly on the issue. This could be explained by the fact that the provision of joint care by biological parents requires joint decision on the care or treatment of their children in order to improve children’s nutritional status. Such decision might also require women’s autonomy to participate in the decision making process of the household equally with the men.
Children from families in poor and middle socio-economic positions were more likely to be undernourished than their counterparts. This finding is comparable with the evidence from other similar studies conducted in low- income countries including Ethiopia [4, 7, 8, 17, 22] and indicates that wasting disproportionately affects the poor households.
In considering community level factors, only lack of maternal access to health service facilities significantly affected children’s nutritional status. In this study, these factors were considered as community factors as they were associated with behavioural attributes of the majority of the rural mothers in the studied community. The odds of exposure to the risks of acute undernutrition were higher among the children whose mothers had no access to the health service facilities than their counterparts. This is similar to the findings of other studies in which the expansion of healthcare infrastructures have significantly reduced the risk of child undernutrition [22, 29]. In this study, access to health care facilities was estimated based on the proxy report of mothers which was based on mother’s main source of health care services and the report of key informants in the study community. According to the principle of primary health care, accessibility was referred to as the availability of health care facilities for the clients within 10 kilometers radius .
Among the individual level factors, exclusive breastfeeding and narrow birth interval were significantly associated with children’s nutritional status. The odds of acute undernutrition were higher among the children of gravid mothers whose birth interval was less than two years between the index-child and his or her older one compared to that of mothers whose interval was reported to be greater. This finding was in agreement with evidence from similar studies in which subsequent births led to child undernutrition . This might be due to the short duration of breastfeeding which could result in inadequate intake of breast milk nutrients by the older child increasing the risk of undernutrition.
Non-exclusively breastfed children were more likely to be undernourished than their exclusively breastfed counterparts. This finding is consistent with similar studies conducted in low-income countries including Ethiopia [20, 21, 38]. This could be due to lack of essential nutrients from the breast milk during the first six months of life and later. These nutrients are known to prevent disease transmission by improving children’s immunity status and through interruption of infection-malnutrition cycle. This in turn improves child survival, growth, and development and prevents the sequel of undernutrition in later life [53, 54].
Unlike other similar studies, among the basic (household) risk factors of child undernutrition, maternal education turned out to be insignificant in this study [20, 22, 23]. However, it was observed that paternal education had the marginal effect on the nutritional status of children. Lack of association between parental education and children’s nutritional status might be attributed to the overall literacy status of the study setting in that the majority of the parents involved in the study were illiterate. In the same line, none of the child related individual level risk factors were significantly associated with acute child undernutrition in contrast with the findings of other similar studies [18, 20–23, 26, 27].
This study has strengths. One of its strengths is that it has used adequate sample size with initial random selection of the study participants from KDS -HRC data base by using a sampling frame to minimize a selection bias. The other is that in a nested case-control study recall and selection biases, which are common problems in standard case–control studies, can be avoided because exposure assessment did not require contact with study participants .
However, this study could have the following limitations. One is that the nutritional surveys are prone to technical error of anthropometric measurement (TEM), which could result in misclassification of children’s nutritional status. The study‘s findings could also be affected by recall and interviewer bias due to the retrospective tracking of information beyond the advantages of a nested case–control study. However, due attention was given to the study procedures, including the process of training the research team, standardization of anthropometric measurements , and a close supervision throughout the field activities to minimize the expected biases.
In sum, wasting was related to the households’ poverty, poor access to health services, lack of mutual decision – making on the care or treatment of their sick child between biological parents, closer birth interval, and non-exclusive breastfeeding practice. Thus, an organized effort should be made at all levels to improve infant and young child feeding, health services, child birth spacing behavior, and exclusive breastfeeding practice of the poor rural population particularly mothers to curb the problems of child undernutrition.
GE is a lecturer in the Department of Public Health at Haramaya University, Ethiopia. He also has supervised many masters and under - graduate students. YB is a senior professor of epidemiology and public health and director of the Addis Continental Institute of Public Health, Ethiopia. He has been teaching several courses in public health including, epidemiology and research methodology in various Universities. He has also supervised many masters and doctoral students. He has more than 100 publications in national and international journals. AW is associate professor at Addis Ababa University, Ethiopia. He has been teaching biostatics and research methods in various Universities for many years. He has more than 40 publications in peer reviewed national and international journals.
First, our deep gratitude extends to the Haramaya University for its financial support for this research. Secondly, we are very much grateful to the supervisors, data collectors, respondents, and all other involved individuals for their contribution.
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