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Erschienen in: BMC Pediatrics 1/2017

Open Access 01.12.2017 | Research article

Determinants of stunting and severe stunting among Burundian children aged 6-23 months: evidence from a national cross-sectional household survey, 2014

verfasst von: Sandra Nkurunziza, Bruno Meessen, Jean-Pierre Van geertruyden, Catherine Korachais

Erschienen in: BMC Pediatrics | Ausgabe 1/2017

Abstract

Background

Burundi is one of the poorest countries and is among the four countries with the highest prevalence of stunting (58%) among children aged less than 5 years. This situation undermines the economic growth of the country as undernutrition is strongly associated with less schooling and reduced economic productivity. Identifying the determinants of stunting and severe stunting may help policy-makers to direct the limited Burundian resources to the most vulnerable segments of the population, and thus make it more cost effective. This study aimed to identify predictors of stunting and severe stunting among children aged less than two years in Burundi.

Methods

The sample is made up of 6199 children aged 6 to 23 months with complete anthropometric measurements from the baseline survey of an impact evaluation study of the Performance-Based financing (PBF) scheme applied to nutrition services in Burundi from 2015 to 2017. Binary and multivariable logistic regression analyses were used to examine stunting and severe stunting against a set of child, parental and household variables such as child’s age or breastfeeding pattern, mother’s age or knowledge of malnutrition, household size or socio-economic status.

Results

The prevalence of stunting and severe stunting were 53% [95%CI: 51.8-54.3] and 20.9% [95%CI: 19.9-22.0] respectively. Compared to children from 6-11 months, children of 12-17 months and 18-23 months had a higher risk of stunting (AdjOR:2.1; 95% CI: 1.8-2.4 and 3.2; 95% CI: 2.8-3.7). Other predictors for stunting were small babies (AdjOR=1.5; 95% CI: 1.3-1.7 for medium-size babies at birth and AdjOR=2.9; 95% CI: 2.4-3.6 for small-size babies at birth) and male children (AdjOR=1.5, 95% CI: 1.4-1.8). In addition, having no education for mothers (AdjOR=1.6; 95% CI: 1.2-2.1), incorrect mothers’ child nutrition status assessment (AdjOR=3.3; 95% CI: 2.8-4), delivering at home (AdjOR=1.4; 95% CI: 1.2-1.6) were found to be predictors for stunting. More than to 2 under five children in the household (AdjOR=1.45; 95% CI: 1.1-1.9 for stunting and AdjOR= 1.5; 95% CI: 1.2-1.9 for severe stunting) and wealth were found to be predictors for both stunting and severe stunting. The factors associated with stunting were found to be applicable for severe stunting as well.

Conclusion

Mother’s education level, mother’s knowledge about child nutrition status assessment and health facility delivery were predictors of child stunting. Our study confirms that stunting and severe stunting is in Burundi, as elsewhere, a multi-sectorial problem. Some determinants relate to the general development of Burundi: education of girls, poverty, and food security; will be addressed by a large array of actions. Some others relate to the health sector and its performance – we think in particular of the number of children under five in the household (birth spacing), the relationship with the health center and the knowledge of the mother on malnutrition. Our findings confirm that the Ministry of Health and its partners should strive for better performing and holistic nutrition services: they can contribute to better nutrition outcomes.
Abkürzungen
AdjOR
Adjusted Odds Ratio
cOR
Crude Odds Ratio
DHS
Demographic and Health Survey
FANTA
Food and Nutrition Technical Assistance
GDP
Gross Domestic Product
HFIAS
Household Food Insecurity Access Scale
IRB
Institutional Review Board
LMIC
Low and Middle Income Country
NCT
National Clinical Trial
PBF
Performance Based-Financing
SD
Standard Deviation
SDG
Sustainable Development Goals
UNICEF
United Nations of International Children's Emergency Fund
WHO
World Health Organization.

Background

One of the sustainable development goals (SDGs) is to end all forms of malnutrition by 2030 [1]. There are two categories of malnutrition: on the one hand undernutrition which encompasses stunting, wasting and deficiencies of micronutrients (i.e. vitamins and minerals) and on the other hand overweight, obesity due to over-consumption of specific nutrients. Worldwide, in 2014, 23.8% of the children under-five years of age were stunted following the WHO definition, 7.5% were wasted but 6.1% had overweight or were obese [2, 3].
Undernutrition makes children more vulnerable to severe diseases. In 2015, undernutrition was considered to be an underlying contributing factor in about 45% of the 5.9 million children who died under the age of five. Actually, the number of global deaths and DALYs lost among children under-five years of age attributed to maternal and child undernutrition constitutes the largest percentage of all risks in this age group]. Moreover, child undernutrition is a strong predictor for less schooling and reduced economic productivity when adult [4, 5], which in turn are both risk factors for raising undernourished children, making it all a vicious circle. Thus, the fight against malnutrition is a long term investment for health but also for economic growth and social wellbeing for both present and future generations.
Developing countries host the bulk of the global stunting and child mortality rate. The situation is particularly critical in Sub-Sahara Africa where one third of the stunted under-five years of age children are retrieved and where stunted children are 14 times more likely to die before the age of five[6]. Actually, although the global trend in stunting has been decreasing from 39.6% in 1990 to 23.8% in 2014, the absolute number of stunted children in Africa has increased by 23% within the same period [3, 7]. This dramatic situation calls for actions; African leaders have to set up strategic plans to reduce both the epidemiologic and socioeconomic burden of malnutrition, and turn the vicious circle into a virtuous one.
There is a large body of evidence on the factors of malnutrition in Low Income Countries (LICs) and sub-Saharan Africa. A multi-national cohort study revealed an association between poverty and stunting [8]. Suboptimal breastfeeding, and inappropriate complementary feeding practices, recurrent infections and micronutrient deficiencies are also important determinants of stunting [9, 10]. When poverty becomes an permanent condition, it leads to a cumulative inadequate food intake and poor health conditions from which arises stunting [11]: the increased frequency and severity of infections in poorly nourished children results in growth impairment[11]. More comprehensively, linear growth failure occurs within a complex interplay of other more distant community and societal factors, such as access to healthcare and education, political stability, urbanization, population density and social support networks: this has been described in the World Health Organization (WHO) Conceptual Framework on Childhood Stunting [12] (Figure 1).
This research zooms in on malnutrition in Burundi, one of the poorest countries in the world with an estimated per capita gross national income of $280 in 2013 [13]. Densely populated, it has a population of approximately 10.6 million inhabitants on a total area of 27,830 square kilometers and 90% of the population is living in rural areas from agriculture and 61.5% of the population in this area cannot meet their basic needs in terms of calorie intake [13]. Burundi has the highest prevalence of stunting (58%) worldwide, together with Timor Leste [14]. Burundian children aged less than five years suffer from an important mortality rate of 82‰ per year [15].
The available literature on the Burundian nutrition context consists mainly in reports from different partners in health looking at the trend of acute and chronic malnutrition in the most affected provinces of the country [16]. Beside those descriptive reports, there is an impact evaluation report of a nutrition program run in two provinces of eastern Burundi between 2010 and 2014. The two-year impact of the nutrition program consisting of three core components (distribution of food rations, participation in behavior change communication sessions delivered via care groups and attendance at preventive health services) had been positive on household access to food, child feeding practices and child morbidity. However, as the evaluation came too early in the study process, the impact on child undernutrition could not yet be evaluated [1719]. A relevant report, in regards to our research, comes from UNICEF who used the 2010 Demographic and Health Survey data (DHS) to assess the predictors factors of child undernutrition in Burundi [20] and found that gender, age, mother’s age, wealth index, dependency ratio and region of residence were associated to stunting. Another study explored the impact of the civil war on child’s health status found, after controlling for province of residence, birth cohort, individual and household characteristics, and province-specific time trends, that children exposed to the war have on average 0.52 standard deviations lower height-for-age z-scores than non-exposed children [21].
We update and complete these findings to have a comprehensive knowledge about the determinants of stunting in the local Burundian context. This is vital to develop prevention strategies and strengthen nutrition intervention programs. We’ve included more independent variables such as mother’s knowledge, household’s food security, breastfeeding, birth weight proxy, place of delivery, arable land ownership. The findings should help policy-makers to direct the limited Burundian resources to the most vulnerable segments of the population, and thus make it more cost effective. It may also help in designing new intervention strategies aimed at reducing the number of malnourished children. Therefore, the aim of the study was to identify predictors of stunting and severe stunting among children aged less than two years in Burundi.

Methods

Study design and sample size

We used household baseline data from an impact evaluation study which aims to measure and understand the effects of the Performance-Based Financing (PBF) scheme applied to nutrition services in Burundi at facility level and community level. The protocol of this impact evaluation is described elsewhere [22]. Briefly, the study has a cluster-randomized controlled trial design, with health center as the primary unit of sampling and sous-colline (the smallest administrative entity with a variable number of villages) as the secondary unit sampling. The sample size was computed on the smallest difference in the main outcome that can be considered of public health significance which is equivalent to a reduction of ≅25% in acute malnutrition prevalence (2.5% points in absolute terms) in intervention centers as compared to control centers. Assuming that the intervention will decrease the prevalence of moderate acute malnutrition in children aged 6 to 23 months from 10% to 7.5% [23] while accepting a 2-sided α-error of 5% and a β-error of 20% indicated to survey at least 65 children aged 6-23 months in the catchment area of each health center. Among the 193 health centers providing nutritional services, 90 health centers were randomly selected (computer-based randomization) and randomized to either the intervention or control group. The number of children per health center was increased to 72 to allow for missing or incomplete data, amounting to a total of 6,480 children aged 6-23 months. The Nutrition PBF impact evaluation study is registered on ClinicalTrials.​gov with the following identifier: NCT02721160 [22].

Data Collection

Households were eligible for the survey when (i) they had at least one child aged 6-23 months and (ii) the eligible child was present together with their mother or primary caregiver and the household head. The first visited household was chosen as follows: from the center of the sous-colline, a pen was thrown in the air to indicate the direction to be taken by the surveyors; following this direction, the first household reached with an eligible child was the first to be surveyed (only if caregiver and head were present and gave their consent). The surveyors would then continue on the same direction to find the second household to be surveyed, and so on. In case of more than one eligible child in the household, one of them was randomly selected. Data collection tools consisted in three modules: a questionnaire administered to the household head, a questionnaire to the mother and one anthropometrics module. The household head questionnaire allowed to get information on general household characteristics such as household head education, gender and occupation, household size, distance to health center, as well as to assess the household socio-economic status and their food security status. The questionnaire administered to the mother collected information on her age, education, occupation and parity. It also allowed to get information on her feeding practices with the selected child and on her knowledge on nutrition; we also collected information on the health of the child (vaccination status, health problems in the last two weeks, visits to the health center). The module on anthropometrics collected the weight, height, mid-upper arm circumference and presence of edema of the child (as well as the mid-upper arm circumference (MUAC) of the mother).
In the field, surveyors worked in pairs with one supervisor per six pairs of surveyors. Each pair carried a SECA® 876 flat scale, a UNICEF measuring board and a SECA® 212 measuring tape. Surveyors were given comprehensive training in the taking of anthropometric measurements and a standardization exercise was carried out during the course of the training. The questionnaire was filled in on a smartphone, using the Open Data Kit Collect application[24], which allowed for: adding constraints into the data field, automatically skipping irrelevant questions/filtering to relevant questions, and obliging the surveyor to respond to every question before finalizing the questionnaire. Close supervision also allowed for a good quality control. Finally, lot quality assurance sampling (LQAS) was performed in order to ensure high quality anthropometrics measurements1.

Data analysis

Stunting

We used the 2006 World Health Organization (WHO) Child Growth Standards. Height-for-age z-scores were used to assess the chronic nutritional status of children [25]. The height-for-age z-score expresses a child’s height in terms of the number of standard deviations (SDs) above or below the median height of healthy children in the same age group or in a reference group. Children with a measurement of <−2 SD from the median were considered as short for their age (stunted), while children with measurement of <−3 SD from the median group were considered to be severely stunted.

Explanatory variables

The explanatory variables were chosen on the basis of the WHO conceptual framework on childhood stunting [12] which is built on the UNICEF framework on causes of malnutrition (Figure 1). Both frameworks highlight the context, causes and consequences of stunting. However, the basic and underlying causes are more itemized in the WHO conceptual framework enabling a more context specific guidance in developing of nutrition-sensitive strategies.
We classified the factors into three levels: parental-, child-, household-level factors. Parental-level factors include maternal education, mother’s age, marital status as well as a variable assessing her knowledge of malnutrition. For the latter, we compared the mother’s satisfaction about the child’s nutrition status to the actual child’s nutrition status and categorized mothers with either a correct or an incorrect assessment of their child’s nutrition status.
Child-level factors were age, sex, place of delivery, child’s breastfeeding pattern, sickness episode within the two last weeks, feeding practices and a proxy of their birth weight. The age of children was estimated first by using the birth dates reported on their immunization card (94% of children) and only secondary by asking the mother.
In our survey sample, the birth weight was only present on the immunization card in 30% of the cases. It has been proven from 3 Demographic and Health Surveys (DHS) conducted in three low- and middle-income countries (LMICs) that the mother’s perception of size is a good proxy of birth weight [26] and in our study the 30% children of whom we knew the birth weight was also correlated (r=-0.44) with the mother’s perception. Therefore, we used the perceived size of the child at birth by the mother as a proxy of the child’s birth weight. Using the twenty-four hours recall on the child’s diet and based on the WHO guidelines on indicators assessing infant and young child feeding practices, we compute the minimum acceptable diet which encompasses the minimum dietary diversity and the minimum meal frequency [27].
Household level factors were household head education, food insecurity, socio-economic status, source of drinking water, time to the health center, household size and number of children aged less than 5 years in the household, arable land ownership. The assessment of household food insecurity was based on the 2007 Household Food Insecurity Access Scale (HFIAS) generic questions, created by the Food and Nutrition Technical Assistance (FANTA) project [28]. These have been validated in a number of different contexts and over different time-periods. The section includes nine occurrence questions, with an increasing level of severity of food insecurity (access) and nine questions concerning ‘frequency-of-occurrence’ to determine how often food insecurity occurred [28]. A household wealth index was calculated as a score of household assets such as ownership of means of transport, ownership of durable goods and household facilities. Weights for each variable were obtained thanks to a principal components analysis method [29]. This index was divided into five quintiles, and each household was assigned to one of these categories: poorest, poorer, middle, rich and richest.

Statistical analyses

To determine the level of stunting and severe stunting in children aged 6-23 months, the dependent variable was expressed as a dichotomous, that is, “not stunted” (≥-2 SD) or “not severely stunted” (≥-3 SD) versus “stunted” (<-2 SD) or “severely stunted” (<-3 SD). Logistic regression analyses were performed using Stata® (version 12.1 College Station, Texas 77845 USA). Bivariate analysis was done for all explanatory variables to identify those associated with children stunting and severe stunting. Variables with p-value below 0.10 in the bivariate analysis were included in the multivariable analysis model. Adjustments for the cluster sampling design effects were incorporated using the “vce” command. A manual procedure of stepwise backward elimination process was then used to identify factors that were significantly associated with the study outcomes using 5 % significance level. The adjusted odds ratios (AdjOR) with 95% confidence Intervals (CIs) were calculated and those with p<0.05 were considered to be significant. Collinearity and interaction between independent variables were assessed.

Results

Characteristics of the sample

The respondent rate was 95.7% (n=6199). The prevalence of stunting and severe stunting were 53.0% (95% CI:51.8-54.3) and 21% (95% CI:19.9-22.0) respectively (Table 1). Male and female children were nearly equally represented as well as age categories. Among the children who experienced a sickness episode during the two last week 59.1% (95% CI:57.9-60.3), the majority had fever 54.6% (95% CI:53.0-56.7). 83.9% (95% CI:83.0-84.8) of the children were born at a health facility. Almost all children have been breastfed (99.9%; 95% CI:99.8-99.9) and 83.4% (95% CI:81.7-85.1) of the children aged between 18 and 23 months were still on breastfeeding at the moment of the survey. Only 24.8% (95% CI:23.9-26.0) of the children had the recommended diet according to their age with respect to frequency and diversity (Table 1).
Table 1
Characteristics of children aged 6–23 months: national cross-sectional survey, Burundi 2014
Child characteristics
Number
Stunted
Not stunted
Severely stunted
Not severely stunted
%[95% CI]
Nutrition status
6199
     
 Stunting
 
3291
2908
NA
NA
53.0% [51.8-54.3]
 Severe stunting
 
NA
NA
1301
4898
20.9% [19.9-22.0]
Sex
6199
     
 Male
 
1747
1281
778
2250
48.8% [47.6-50.0]
 Female
 
1544
1627
523
2648
51.1% [49.9-52.4]
Age (months)
6199
     
 6-11
 
843
1338
267
1914
35.1% [34.0-36.3]
 12-17
 
1167
909
447
1609
33.4% [32.3-34.6]
 18-23
 
1281
661
567
1375
31.3% [30.1-32.4]
Sickness episode within 2 weeks
6199
     
 No
 
1324
1207
485
2046
40.8% [39.6-42.0]
 Yes
3668
1967
1701
816
2852
59.1% [57.9-60.3]
 Diarrhea
 
727
556
315
968
34.9% [33.4-36.5]
 Fever
 
1086
919
472
1533
54.6% [53.0-56.7]
 Respiratory infection
 
617
600
264
953
33.1% [31.6-34.7]
Breastfeeding practices
      
 Has been breastfed
6197
3285
2906
1297
4895
99,9% [99.8-99.9]
 Children weaned
6164
288
151
134
305
7.1% [6.4-7.7]
 Exclusive 6 months breastfeeding
6074
2654
2308
1026
3936
81.6% [80.7-82.6]
Continuous to be breastfed
      
  6-11 months
2176
839
1331
264
1906
99.7% [99.5-99.9]
 12-17 months
2067
1097
855
438
1514
94.44% [93.4-95.4]
 18-23 months
1921
1046
557
453
1150
83.4% [81.7-85.1]
Minimum acceptable diet
      
  All
6144
834
701
316
1219
24.8% [23.9-26.0]
  6-11months
2173
161
223
52
332
17.6% [16.0-19.2]
 12-17 months
2060
310
258
120
448
27.5% [25.6-29.0]
 18-23 months
1911
363
220
144
439
30.5% [28.4-32.5]
Place of delivery
6189
     
 Home
 
600
395
247
748
16.0% [15.1-16.9]
 Health facility
 
2683
2511
1050
4144
83.9% [83.0-84.8]
Birth weight proxy (Mother’s perception on size of the baby at birth)
6174
     
 Large
 
579
767
191
1155
21.8% [20.7-22.8%]
 Average
 
2157
1869
833
3193
65.2% [64.0-66.4]
 Small
 
539
263
267
535
12.9% [12.1-13.8]
Half of the mothers were aged between 25 and 34 years. Around three quarters of them were without any education and two third had the impression that their babies were of average size at birth. The majority of the households visited were in couple (legally married or not) (91.9%; 95% CI:91.3-92.6).
At the moment of the interview, 58.5% (CI 95%:57.2-59.7) of the mothers perceived their children with a correct nutrition status (Table 2). Even though 90.3% (95% CI:89.6-91.1) of the households visited had arable land, 91.9% (95% CI:91.1-92.5) of them were experiencing food insecurity. The average household’s size was five persons (IQR=4-7). Half of the households (49.8%; 95% CI:48.5-51.0) lived at more than one hour walking to the health center (Table 3 ).
Table 2
Characteristics of the parents: national cross-sectional survey, Burundi 2014
Parental Characteristics
Number
Stunted children
Not stunted Children
Severely stunted children
Not severely stunted children
%[95 CI]
Mother’s education
6199
     
 No education
 
2449
2076
990
3535
73% [71.8-74.1]
 Primary
 
765
684
283
1166
23.3% [22.3-24.4]
 Secondary and above
 
77
148
28
197
3.6% [3.1-4.1]
Mother’s age
6081
     
 15-24 years
 
996
915
385
1526
31.4% [30.2-32.5]
 25-34 years
 
1564
1427
620
2371
49.1% [47.9-50.4]
 34-49 years
 
660
519
266
913
19.3% [18.3-20.3]
Mother’s child nutrition assessment vs current child’s nutrition status
6173
     
 Uncorrect
 
1799
764
593
1970
41.5% [4.29-42.7]
 Correct
 
1478
2132
701
2909
58. 4% [57.2-59.7]
Marital status
6199
     
 In couple (legally married or not)
 
3012
2690
1165
4537
91.9% [91.3-92.6]
 Live alone (div/sep/widow)
 
279
218
136
361
8.0%[7.3-8.6]
Table 3
Households’ characteristics: national cross-sectional survey, Burundi 2014
Household Characteristics
n
Stunted children
Not stunted children
Severely stunted children
Not severely stunted children
%[95 CI]
Household Size
6199
     
 <5
 
1752
1499
689
2562
52.4% [46.3-48.8]
 ≥5
 
1539
1409
612
2336
47.5% [46.3-53.6]
#Children Under 5
6199
     
 ≤2
 
3103
2770
1127
4656
94.7% [94.1-95.3]
 >2
 
188
138
84
242
5.2% [4.7-5.8]
Household head education
6015
     
 No education
 
2206
1843
916
3133
67.3% [66.1-68.5]
 Primary
 
888
818
322
1384
28.3% [27.2-29.5]
 Secondary
 
102
158
32
228
4.3% [3.8-4.8]
Arable land ownership
6195
     
 No
 
317
280
134
463
9.6% [8.9-10.3]
 Yes
 
2972
2626
1166
4432
90.3% [89.6-91.1]
Source of drinking water
6199
     
 Not protected
 
1881
1618
746
2753
56.4% [55.2-57.6]
 Protected
 
1410
1290
555
2145
43.5% [42.3-44.7]
Time to the Health centre
5996
     
 <30 min
 
654
651
244
1061
21.7% [20.7-22.8]
 30-60 min
 
903
801
336
1368
28. 4% [27.2-29.5]
 >60 min
 
1621
1366
681
2306
49. 8% [48.5-51.0]
Food security level
6189
     
 Food security
 
233
272
77
428
8.1% [7.4-8.8]
 Low food insecurity
 
147
149
49
247
4.7% [4.2-5.3]
 Moderate food insecurity
 
559
617
197
979
19.0% [18.0-19.9]
 Severe food insecurity
 
2346
1866
974
3238
68.0% [66.8-69.2]

Factors associated with stunting and severe stunting

Child level variables

Male was found to be associated with stunting (cOR=1.4; 95% CI: [1.3-1.5]; p<0.001) and severe stunting (cOR=1.7; 95% CI: [1.5-1.9]; p<0.001). The odds of being stunted for children aged 12 to 17 months and 18-23 months were respectively two times more (95% CI: [1.8-2.3] for stunted and 95% CI:[1.7-2.4] for severely stunted) and three times more (95% CI:2.7-3.4 for stunted and 95% CI:2.5-3.4 for severely stunted) than the odds of children aged 6-11 months (both p<0.001). Children aged 18-23 months for whom the minimum acceptable diet was correct in the 24 previous hours were less likely to be stunted (cOR=0.78; 95% CI: 0.64-0.96; p=0.02) and severely stunted (cOR=0.72; 95% CI: 0.58-0.91; p=0.005) than those from same age category with not appropriate complementary food. Children born at home were more likely to be stunted (cOR=1.4; 95% CI: 1.2-1.6; p<0.001) and severely stunted (cOR=1.3; 95% CI: 1.1-1.5; p=0.001) than those born at health facility.

Parental level variables

Children whose mothers had no education were more likely to be stunted (cOR=2.3; 95% CI: 1.7-3; p<0.001) and severely stunted (cOR= 2.0; 95% CI: 1.3-2.9; p<0.001) than those whose mothers reached secondary school and above. Children who were perceived by their mothers to be of medium or smaller size at birth were more likely to be stunted (cOR=1.5; 95% CI:1.3-1.7; p<0.001) (cOR=2.7; 95% CI:2.2-3.2; p<0.001) and severely stunted (cOR=1.5; 95% CI:1.3-1.8; p<0.001) (cOR=3.0; 95% CI:2.4-3.7; p<0.001) than those who were perceived to be larger. Children whose mother was not able to assess correctly the nutrition status were more likely to be stunted (cOR=3.4; 95% CI: 3.1-3.8; p<0.001) and severely stunted (cOR=1.2; 95% CI: 1.1-1.14; p<0.001) than those whose mother do know. Beside these common parental level factors associated with stunting and severe stunting in Burundian setting, the marital status of the mother (living in couple) was found to be associated with severe stunting (in couple: cOR:1.5; 95% CI: 1.2-1.8; p=0.001).

Household level variables

Children from a non-educated household head were more likely to be stunted (cOR=1.9; 95% CI: 1.4-2.4; p<0.001) and severely stunted (cOR=2.1; 95% CI: 1.4-3.0; p<0.001) than children from household head with secondary school and above. Children who were living at more than one walking hour from the health center had 1.2 (95% CI: 1.1-1.1.3; p: 0.01) times more odds to be stunted and 1.2 (95% CI: 1.1-1.5; p: 0.003) times more odds to be severely stunted than those living at less than 30 min walking. Children from household experiencing severe food insecurity had 1.4 (95% CI: 1.2-1.7; p<0.001) more odds of stunting and 1.6 (95% CI: 1.3-2.1; p<0.001) more odds of severe stunting than those living in food secured household. Children from poor households were more likely to be stunted compared to all other wealthier categories. Beside these common household level factors associated with stunting and severe stunting, the number of children under five of years in the household was found to be associated with severe stunting (Table 4).
Table 4
Factors associated with stunting and severe stunting in Burundian children aged 6-23 months, 2014
 
Stunted
Severely stunted
Child characteristics
Crude OR
p-value
Adjusted OR
p-value
Crude OR
p-value
Adjusted OR
p-value
Sex
 Female
1.0
 
1.0
 
1.0
 
1.0
 
 Male
1.4 [1.3-1.5]
<0.001
1.5 [1.4-1.8]
<0.001
1.7 [1.5-1.9]
<0.001
1.9 [1.6-2.2]
<0.001
Age (months)
 6-11
1.0
 
1.0
 
1.0
 
1.0
 
 12-17
2.0 [1.8-2.3]
<0.001
2.1 [1.8-2.4]
<0.001
2.0 [1.7-2.4]
<0.001
2.2 [1.9-2.6]
<0.001
 18-23
3.0 [2.7-3.4]
<0.001
3.2 [2.8-3.7]
<0.001
2.9 [2.5-3.4]
<0.001
3.0 [2.7-3.9]
<0.001
Sickness episode within 2 weeks
 No
1.0
   
1.0
   
 Yes
1.0 [0.9-1.1]
0.31
  
1.2 [1.1-1.4]
0.003
  
Place of delivery
 Health facility
1.0
 
1.0
 
1.0
   
 Home
1.4 [1.2-1.6]
<0.001
1.4 [1.2-1.6]
<0.001
1.3 [1.1-1.5]
0.001
1.2 [1.1-1.5]
0.03
Exclusive 6 months breastfeeding
 No
1.0
   
1.0
   
 Yes
1.1 [0.9-1.2]
0.20
  
0.90 [0.77-1.06]
0.20
  
Continuous to be breastfed
 6-11 months
        
  No
1.0
   
1.0
   
  Yes
1.2 [0.2-6.9]
0.27
  
0.69 [0.08-5.95]
0.74
  
 12-17 months
  No
1.0
   
1.0
   
  Yes
1.0[0.7-1.4]
0.11
  
0.90 [0.57-1.39]
0.63
  
 18-23 months
  No
1.0
   
1.0
   
  Yes
0.81 [0.62-1.05]
0.12
  
0.80 [0.62-1.03]
0.09
  
Minimum acceptable diet
 All
  No
1.0
   
1.0
   
  Yes
1.1 [0.9-1.2]
0.25
  
0.97 [0.84-1.12]
0.68
  
 6-11 months
  No
1.0
   
1.0
   
  Yes
1.1 [0.9-1.4]
0.15
  
1.1 [0.8-1.6]
0.38
  
 12-17 months
  No
1.0
   
1.0
   
  Yes
0.91 [0.75-1.11]
0.37
  
0.89 [0.70-1.12]
0.33
  
 18-23 months
  No
1.0
   
1.0
   
  Yes
0.78 [0.64-0.96]
0.02
  
0.72 [0.58-0.91]
0.005
  
Birth weight proxy (mother’s perception of the baby size at birth)
 Large
1.0
   
1.0
 
1.0
 
 Medium
1.5 [1.3-1.7]
<0.001
1.5 [1.3-1.7]
<0.001
1.5 [1.3-1.8]
<0.001
1.6 [1.3-1.9]
<0.001
 Small
2.7 [2.2- 3.2]
<0.001
2.9 [2.4-3.6]
<0.001
3.0 [2.4-3.7]
<0.001
3.3 [2.6-4.1]
<0.001
Parental characteristics
Maternal education
Secondary and above
1.0
 
1.0
 
1.0
   
 Primary
2.1 [1.6-2.9]
<0.001
1.6 [1.2-2.1]
0.002
1.7 [1.1-2.6]
0.01
  
 No education
2.3 [1.7-3]
<0.001
1.6[1.2-2.1]
0.001
2.0 [1.3-2.9]
<0.001
  
Mother’s age
 15-24 years
1.0
   
1.0
   
 25-34 years
1.0 [0.9-1.1]
0.91
  
1.0 [0.9-1.2]
0.62
  
 34-49 years
1.1 [1.0-1.3]
0.03
  
1.1 [0.9-1.3]
0.11
  
Mother’s nutrition assessment vs current child’s nutrition status
 Correct
1.0
   
1.0
   
 Uncorrect
3.4 [3.1-3.8]
<0.001
3.3 [2.8-4]
<0.001
1.2 [1.1-1.14]
<0.001
  
Marital status
 Live in couple ( married or not) Live alone (div/sep/widow)
1.0
   
1.0
   
 Live alone (div/sep/widow)
1.1 [0.95-1.4]
0.10
  
1.5 [1.2-1.8]
0.001
  
Household characteristics
 Household head education
  Secondary and above
1.0
   
1.0
   
  Primary
1.7 [1.3-2.2]
<0.001
  
1.7 [1.1-2.4]
0.01
  
  No education
1.9 [1.4-2.4]
<0.001
  
2.1 [1.4-3.0]
<0.001
  
 Household Size
  <5
1.0
   
1.0
   
  >=5
1.0 [0.9-1.1]
0.1
  
1.0 [0.9-1.1]
0.6
  
 #Children Under 5
        
  1 or 2
1.0
 
1.0
 
1.0
 
1.0
 
   >2
1.2 [0.97-1.5]
0.08
1.45 [1.1-1.9]
0.003
1.3 [1.1-1.17]
0.03
1.5 [1.2-1.9]
0.001
Time to the Health centre
 <30 min
1.0
   
1.0
   
 30-60 min
1.1 [0.9-1.3]
0.1
  
1.0 [0.8- 1.2]
0.4
  
 >60 min
1.2 [1.1- 1.3]
0.01
  
1.2 [1.1- 1.5]
0.003
  
 Arable land ownership
  Yes
1.0
   
1.0
   
  No
1.0 [0.84-1.2]
0.99
  
1.1 [0.90-1.3]
0.36
  
Source of drinking water
 Protected
1.0
   
1.0
   
 unprotected
1.1 [0.96-1.2]
0.23
  
1.0 [0.93-1.2]
0.46
  
Food security level
 Food secure
1.0
   
1.0
   
 Low food insecure
1.1 [0.8-1.5]
0.34
  
1.1 [0.7-1.6]
0.62
  
 Moderate food insecure
1.0 [0.8-1.3]
0.60
  
1.1 [0.8-1.4]
0.44
  
 Severe food insecure
1.4 [1.2- 1.7]
<0.001
  
1.6 [1.3- 2.1]
<0.001
  
SE status
 Richest
1.0
 
1.0
 
1.0
 
1.0
 
 Richer
1.4 [1.2-1.7]
<0.001
1.2 [1.1-1.5]
0.01
1.4 [1.1-1.7]
0.003
1.3 [1.1-1.7]
0.03
  Middle
1.7 [1.5-2.0]
<0.001
1.5 [1.21.7]
0.001
1.8[1.4-2.2]
<0.001
1.6 [1.3-2.1]
<0.001
  Poor
2 [1.6-2.3]
<0.001
1.7 [1.4-2.1]
<0.001
2 [1.6-2.5]
<0.001
1.9 [1.5-2.4]
<0.001
  Poorest
2.1[1.8-2.4]
<0.001
2 [1.6-2.3]
<0.001
2.4 [1.9-2.9]
<0.001
2.4 [1.9-2.9]
<0.001

Predictors for stunting

Male children were more likely to be stunted than girls (AdjOR=1.5; 95% CI: 1.4-1.8; p<0.001) (Table 4). Increasing age was associated with stunting (AdjOR=2.1; 95% CI: 1.8-2.4; p<0.001 for children aged 12-17 months and AdjOR=3.2; 95% CI: 2.8-3.7; p<0.001 for children aged 18-23 months). Children who were perceived by their mothers to be of medium or smaller size at birth were more likely to be stunted than those who were perceived to be larger (AdjOR=1.5; 95% CI: 1.3-1.7; p<0.001) (AdjOR=2.9; 95% CI: 2.4-3.6; p<0.001). Children who were delivered at home were more likely to be stunted (AdjOR=1.4; 95% CI: 1.2-1.6; p<0.001) and severely stunted (AdjOR=1.2; 95% CI: 1.1-1.5; p=0.03).
Children whose mothers had no schooling were more likely to be stunted compared with children whose mothers attained secondary school or above (AdjOR=1.6; 95% CI: 1.2-2.1; p=0.001). Children whose mother uncorrectly assess the nutrition status were more likely to be stunted than those whose mother do (AdjOR=3.3; 95% CI: 2.8-4; p<0.001). Children who were delivered at home were more likely to be stunted (AdjOR=1.4; 95% CI: 1.2-1.6; p<0.001). Being in a household with more than two under five years children was associated with more risk of being stunted than being in a household with one or two under five years children (AdjOR=1.4; 95% CI: 1.1-1.9; p=0.003). Children from poorest households were more likely to be stunted compared to all other categories (AdjOR=2; 95% CI: 1.6-2.3; p<0.001) (Table 4).

Predictors for severe stunting

Age was significantly associated with severe stunting (AdjOR=2.2; 95% CI: 1.9-2.6; p<0.001 for children aged 12-17 months and AdjOR=3.0; 95% CI: 2.7-3.9; p<0.001 for children aged 18-23 months compared to children aged 6 to 11 months) and male children were more likely to be severely stunted than females (AdjOR=1.9; 95% CI: 1.6-2.2; p<0.001) (Table 4). Children who were perceived by their mothers to be of medium or smaller size at birth were more likely to be severely stunted than those who were perceived to be larger (AdjOR=1.6; 95% CI: 1.3-1.9; p<0.001) (AdjOR=3.3; 95% CI: 2.6-4.1; p<0.001). Living in a household with more than two under five years children was associated with more odds of being severely stunted than living in a household with one or two under five years children (AdjOR =1.5; 95% CI: 1.2-1.9; p=0.001). Children from poorest households were more likely to be severely stunted compared to all other categories (AdjOR=2.4; 95% CI: 1.9-2.9; p<0.001) (Table 4).
Inappropriate complementary feeding practices was correlated with household socio-economic status (r=0.1) and household food security level (r=-0.2). The latter two were also found to be correlate (r=-0.3).
Collinearity was assessed and found for sanitation and source of drinking water. There was no interaction between independent variables.

Discussion

The prevalence of stunting and severe stunting among children aged 6 to 23 months was 53.0% and 21% respectively. These figures are similar to those from the last DHS conducted in 2010 (58.0%) [23]. This prevalence is high compared to the estimated prevalence of stunted pre-school children for the UN regions and sub-regions in 2015 [7]. Beside the heavy burden in terms of lost DALYS, international studies have shown that undernutrition is strongly associated with less schooling on the medium term [4, 5], and reduced economic productivity on the long term [30], something has to be done in order to stop the vicious circle.
Our study showed that the increased age of the child was associated with stunting and severe stunting. Similar findings were reported in other studies conducted in different LMICs [31, 32]. This could be explained by the inappropriate complementary food that children receive, due to the high prevalence of household’s severe food insecurity (68%). As children are growing up, they need adequate complementary food, in quantity and in quality, as a complement to the breast milk [10, 33]: our study found that only 30% of the children aged between 18-23 months received appropriate complementary food in regards to both frequency and diversity. In the bivariate analyses, stunting and severe stunting were associated with inappropriate complementary feeding practices but this turned out to be non-significant in the multivariate analysis.
Gender was another predictor of stunting and severe stunting in children aged 6-23 months as boys had higher odds of becoming stunted or severely stunted compared to girls, supporting previous findings in the region [31, 34]. A meta-analysis of 16 demographic and health surveys in Sub-Saharan Africa revealed the same results with an explanation oriented towards a historical pattern of preferential treatment of females due to high value placed on women’s agricultural labor [35]. However, such hypothesis cannot be ascertained in our study as there is a gender balance among children who had appropriate complementary food in the previous 24 hours before the survey.
Children whose mothers perceived them to be small or medium size at birth-a proxy of birth weight- were found to be at higher odds of being stunted and severely stunted compared to those perceived to be larger. Other studies conducted in Tanzania in 2015 and in Nepal in 2014 had the same findings [31, 36]. More recently, a cohort study conducted in Benin confirms that low birth weight was associated with growth impairment [37].
Our study also reveals that mothers assessing correctly the child nutrition status were less likely to have stunted children than those who did not assess this correctly. This could let assume that mothers who reserved time to learn how to evaluate child nutrition status are the ones who invest in the latter.
Children whose mothers reached secondary school and above were less likely to be stunted than those whose mothers had no schooling which also have been shown in previous studies elsewhere [33]. These two findings demonstrate the importance of education of girls as one strategy to overcome the burden of stunting and to promote good feeding practices for young children. In the present study, children who were delivered at health facility were less likely to be stunted compared to those delivered at home. This matches with findings from the Tanzanian (2015) and Kenyan (2012) studies [31, 34]. This finding hypotheses that mothers who delivered at health facility often use health services, and are thus more informed about good child health care practices.
Children belonging to households with more than two under five children were more likely to be stunted or severely stunted than the others. These results are similar to those found in Somalia [38]. Indeed, more under five children in the family may lead to a higher risk of having insufficient complementary food in a context of severe food insecurity. The children from the poorest socio-economic class were more likely to be stunted and severely stunted than all other categories. This finding is also supported by different studies conducted in LMIC [32, 39].
The factors that our study revealed to be predictors for stunting and severe stunting can be classified according the WHO conceptual framework on childhood stunting 12] into household and family factors (maternal factors and home environment) such as: maternal education, mother’s nutrition status assessment, number of under five years children in the household, size at birth. The others are found to be predictors that are reflected in the context in which the child lives: socio-economic status, place of delivery. As mentioned above, these findings are supported by other studies done elsewhere.

Strengths and weaknesses of the study

The big size of our sample makes our findings precise and reliable for the whole population of the rural parts of Burundi. Though we cannot extrapolate the findings to other countries, they however suggest some trends in similar settings. However since the study has been conducted in rural areas, our findings are not applicable as such for urban settings.
We considered many more variables than previous studies, such as mother’s knowledge on child‘s nutrition status assessment, household’s food security, birth weight proxy, place of delivery, arable land ownership.
A weakness from the surveys was that any reading note wasn’t submitted to the interviewee to make sure of his ability to read and write: this didn’t allow us to consider the literacy variable for the analysis. Another weakness is that we didn’t push further to investigate community and societal factors specifically political economy factors and health factors of the WHO conceptual framework on childhood stunting.

Implications for future research

The study suggests possible new paths for action which could trigger different action research projects, through nutrition community interventions, sensitization for family planning, young girls education, etc. As for the impact of performance-based financing as a mean to reduce malnutrition, through e.g. support nutrition community interventions, we will wait for the follow-up household survey (due early 2017) to perform the impact analyses. Possible other paths for action to study would be better targeting (e.g. through a demand-side financing scheme focused on poorest households), and nutrition community interventions (e.g. sensitization).

Conclusion

We observed that child’s age, boys, a small birth weight (as perceived by the mother), more than two children under-five years of age in the household and household’s poor socioeconomic status were factors associated with stunting and severe stunting. Modeling selected that, mother’s education level, mother’s knowledge about child nutrition status assessment and health facility delivery were predictors of child stunting.
Our study confirms that stunting and severe stunting is in Burundi, as elsewhere, a multi-sectoral problem. Some determinants relate to the general development of Burundi: education of girls, poverty, and food security; will be addressed by a large array of actions. Some others relate to the health sector and its performance – we think in particular of the number of children under five in the household (birth spacing), the relationship with the health center and the knowledge of the mother on malnutrition. Our findings confirm that the Ministry of Health and its partners should strive for better performing and holistic nutrition services: they can contribute to better nutrition outcomes.

Acknowledgements

We would like to extend our deepest gratitude to the World Bank for financing the Impact Evaluation of Introduction of Nutrition criteria in the PBF program in Burundi. Our appreciation goes to Pr Patrick Kolsteren and Dominique Roberfroid for their valuable contributions during the early design of the intervention. The authors would like to thank the persons from the Nutrition Program in Burundi, Kirrily de Polnay, Ulises Huerta, Elodie Macouillard, Manassé Nimpagaritse and Léonard Ntakarutimana for their support in the preparation and implementation of the baseline surveys. The authors would also like to thank the ISTEEBU team who realized the baseline survey. Our appreciation goes to the data collectors and supervisors. Lastly, our special thanks also go to mothers who participated in the study.

Funding

The research project (PBF-Nutrition in Burundi) is funded by the World Bank and the field work of the corresponding author (quality assurance during data collection, qualitative data collection, analysis, interpretation and writing) is funded by VLIR-UOS.

Availability of data and materials

The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.
We used data from a household baseline survey of an Impact Evaluation study of the performance-based financing scheme applied to nutrition services in Burundi at health center level and community level. The ethical clearance was obtained from the Institutional Review Board (IRB) in Belgium and the Burundian Ethics Committee. Informed consent was signed by the respondent and all information was collected confidentially.
Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.
Fußnoten
1
Twice a week, external supervisors followed randomly chosen surveyors and measured again the weight, height, MUAC and oedema presence among the surveyed children; their measurements were confronted to the ones performed by the surveyors and errors were discussed with them. Observed discrepancies were null on average and big discrepancies (more than 200g for weight and 5mm for height and MUAC) were rare which tend to confirm that anthropometrics were of good quality.
 
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Metadaten
Titel
Determinants of stunting and severe stunting among Burundian children aged 6-23 months: evidence from a national cross-sectional household survey, 2014
verfasst von
Sandra Nkurunziza
Bruno Meessen
Jean-Pierre Van geertruyden
Catherine Korachais
Publikationsdatum
01.12.2017
Verlag
BioMed Central
Erschienen in
BMC Pediatrics / Ausgabe 1/2017
Elektronische ISSN: 1471-2431
DOI
https://doi.org/10.1186/s12887-017-0929-2

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