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A comparative analysis of determinants of low birth weight and stunting among under five children of adolescent and non-adolescent mothers using 2015/16 Tanzania Demographic and Health Survey (TDHS)
BMC Nutrition volume 7, Article number: 64 (2021)
Tanzania is one of the Sub-Saharan African country with nearly 12 out of 60 million people being adolescent. The prevalence of child marriage is higher with one out of every three girls being married before reaching their 18th birthday, 5 % being married by the age of 15, and 31% by the age of 18 years. Literature shows early pregnancy is associated with Low Birth Weight (LBW) and stunting among children under 5 years. This paper explores variation and factors associated with low birth weight and stunting among children born by adolescent and non-adolescent mothers.
Data from 13,266 women with children under 5 years collected as part of the 2015/2016 TDHS was re-analyzed using STATA version 14 software while accounting for survey design. A total of 6385 women (of which 7.2% were adolescent) and 8852 women (of which 6.7% were adolescent) were involved in the analysis of child birth weight and stunting respectively. Descriptive statistics stratified by maternal age was conducted with LBW and stunting as outcome variables followed by logistic regressions models controlling for confounding variables.
The proportion of obese or overweight adolescent and non-adolescent mothers was 11.8 and 36.5% respectively. Antenatal care (ANC) attendance, areas of residence and social economic status were very similar in the two maternal age groups. Non- adolescent mothers had reduced odds of giving birth to LBW babies compared to adolescent mothers (Adjusted Odds Ratio (AOR) = 0.34; 95% CI: 0.22–0.50). Maternal undernutrition (AOR = 2.29; 95% CI: 1.43–3.67), being divorced, separated or widowed (AOR = 1.76; 95% CI: 1.24–2.50) and having at least four ANC visits (AOR = 0.64; 95% CI: 0.49–0.83) were significantly associated with reduced odds of having a LBW. Child stunting was not associated with maternal age. Maternal high socioeconomic status (AOR = 0.69; 95% CI: 0.57–0.84) and maternal obesity or overweight (AOR = 0.77; 95% CI: 0.64–0.92) were negatively associated with stunting. Child birth weight, sex, and age were significantly associated with stunting.
Maternal age was a predictor of LBW but not stunting. ANC attendance and not living with a spouse increase the risk of LBW babies. Stunting was associated with low maternal body mass index (BMI), low socioeconomic status, child birth weight, gender, and age. A multi-sectoral approach is needed to address child nutrition problems with teenagers ‘specific intervention that offer emotional support, and health education during pregnancies for improving immediate and later life child birth outcomes.
Globally about 1.2 billion people are adolescents aged 10–19 years  with Sub-Saharan Africa contributing to 23% of the global population of the adolescents . From 2010 to 2030 the expected top five countries in Sub-Saharan Africa with the greatest number of adolescents are Nigeria (9.2 million), the United Republic of Tanzania (3.7 million), the Democratic Republic of the Congo (3.3 million), Uganda (2.5 million) and Kenya (2.3 million) .
Tanzania has a population of approximately 60 million people of which 12 million are adolescents aged 10–19 years . The country has made a significant progress in improving child nutrition status during the period 1992–2015 whereas stunting declined from 50 to 34% . This still higher compared to that of global level 24.4% [23.9–24.8]  and lower compared to that of the Africa region (32%) . Despite these gains there have been little changes in adolescent health indicators. Almost one out of every three girls is married before her 18th birthday . Five percent of girls are married by the age of 15 years, and 31 % are married by the age of 18 years . Despite early marriage, one out of three adolescents are anaemic and one out of four are stunted . Maternal malnutrition is a primary factor of foetal growth retardation in poorer population groups, and pregnant adolescents are at even higher risk . Some literatures also revealed factors like lower level of maternal education, poor access to health service, poor complementary feeding practices, poor living conditions, maternal and child age being associated with childhood stunting [10,11,12].
Childbearing during adolescence is linked to a number of challenges. Teen mothers often have less structural resources, less educated, and lack financial independence as compared to adult mothers in both high, low, and middle-income countries . Often, young mothers are likely to have low maternal weight gain during pregnancy and anemia due to competing needs of nutrients during pregnancy . This explains why adolescent mothers are likely to give birth to preterm, low-birth-weight babies and with an increased likelihood of infant deaths compared to those born with mothers aged 20 years and above . Furthermore, the high rates of teenage pregnancy contribute significantly to the high prevalence of malnutrition among adolescents themselves and their under-five children . Adolescent mothers are not only challenged by the physical threats to their health, but also socially . Majority of them have not completed their education and consequently have a limited capacity to secure jobs and sustain their livelihood and their children too . They also lack important knowledge on child care which may contributes to childhood malnutrition and hence creating a vicious circle of malnutrition and poverty .
Overall, it is estimated that 15 to 20% of all births worldwide are LBW, representing more than 20 million births a year . The estimated prevalence of LBW in Sub Saharan Africa is 13% although 54% of all the children are not weighed at birth . In Tanzania the prevalence of LBW babies is 10%. Maternal age, Body Mass Index (BMI), ANC attendances and place of residence are among factors reported by the literatures as risk factors for LBW babies [12,13,14].
Despite the overwhelming evidence on adolescent social and economic vulnerabilities, little is known about how maternal age contributes to low birth weight and childhood stunting in Tanzania. This paper explored variation and factors associated with LBW and stunting among children born by adolescent and non-adolescent mothers using data collected as part of the 2015/2016 Tanzania Demographic and Health Survey (TDHS) .
Secondary data analysis of the 2015/2016 TDHS was done focusing on adolescent and non-adolescent mothers aged 15–49 years with their children 0–59 months. The TDHS is a national representative cross-sectional survey done after every 5 years to monitor and evaluate population health, nutrition, and maternal indicators including feeding practices and health care seeking behaviors. It contained information collected from 13,400 households located in Zanzibar and mainland Tanzania. The survey employed a two-stage stratified sampling design with the first stage involving independent sampling of 59 strata by population proportion to size (PPS). The second stage involved random sampling of households located in each of the selected cluster. The detailed sampling procedures has been published in the 2015/2016 TDHS report .
All women aged 15–49 who were usual residents or slept in the selected households the night before the survey were eligible for the interview. Anthropometric measurements (height and weight) of child and that of caretakers were taken at household level on the day of survey. Weight measurements were obtained with an electronic SECA 874 flat scale designed for mobile use and Height was measured with a Shorr board measuring board. Children younger than 24 months or shorter than 85 cm were measured lying down on the board (recumbent length) and standing height taken for older or taller children.
Data management and analysis
The 2015/2016 TDHS dataset was downloaded from the DHS website after completing the registration and fulfillment of the conditions related to the protection of sensitive data. A total of 13,634 eligible women were identified from 1782 households sampled. Of interviewed women, 27% (2904) were adolescents aged 15–19 years. Analysis was conducted in a sample of women who had a live birth 5 years preceding the survey using STATA version 14 software accounting for survey design. A total of 8852 women (600 adolescent and 8252 non adolescent) with child anthropometric data and 6386 women (459 adolescent and 5927 non adolescent) with child birth weight data was analyzed.
Variable were categorized as per DHS guideline with the normative category used as a reference group in regression analysis . Maternal nutritional status was assessed using the BMI classified as undernutrition (bmi < 18.5), normal (> 18.5 bmi < 25), overweight (> 25 bmi < 30) and obese (bmi > 30). Stunting and child birth weight of under-five children born by adolescents (15–19 years) and non-adolescent mothers (19–49 years) were considered as primary and secondary outcome respectively . Stunting as an outcome variable was prepared using the 2006 World Health Organization (WHO) growth standards reference points based on z-scores <− 2 standard deviation . A child weighted below 2500 g at birth was termed as low birth weight baby. Maternal age was categorized as adolescent (15–19 years) and non-adolescent (20–29, 30–39 and 40–49 years). The household wealth index was developed based on the household’s assets ownership using the principal component analysis. The five equal categories used in the TDHS reports were further categorized into two groups, with the first three being in the low economic status to reflect the actual Tanzania condition.
Frequencies and percentage were used to presents results from descriptive analysis stratified by outcome variables. Univariate logistic regression models were fitted independently with stunting and birth weight as outcome variables while adjusting for socioeconomic and demographic characteristics such as age, height, weight (for both mother and children), maternal characteristics (education, place of residence) and uptake of maternal care. As anticipated, logistic regression analysis was not done separately for each maternal age (adolescent and adult mothers) due to small sample size particularly in the adolescent population. A pooled analysis was done instead for each outcome variable with maternal age as a main exposure. A forward selection procedure was applied during modelling with variable selection based on change in exposure effect estimate. The procedure involved four main steps: a) descriptive analysis and preliminary investigations for association between variables while paying attention to the sizes of effects as well as p-values at 95% significant level. b) Variable selection; from prior knowledge, child sex was considered as forced variable in the model and maternal employment was ignored as it was highly correlated with social economic status. One variable at a time from a list of candidate variables obtained from a univariate analysis was then included in the model with and without adjustment of forced variables to help understanding the effect of forced variables. The choice of the “best” predictor to be included in the model was then decided based on the change in exposure effect estimate. Each time a new variable was added in the model, evidence of confounding and multicollinearity was assessed by comparing the effect estimates and standard errors between the “univariate” and “multivariate” models estimates c) Multivariable model were fitted by adding explanatory variables that were removed from the models in step “b” one at a time to helps exploring their effect when added to the model in presence of other variables in the model. Variables that resulted into positive changes in the mean square error were then included in the model. The process was repeated until all variables that provided precise estimates of exposure variables were selected. The final model includes maternal age, marital status, maternal BMI, number of ANC visits, and child sex.
Protocol, study procedures and questionnaires for DHS surveys was reviewed and approved by Institutional Review Board (IRB) and by the National Medical Research committee of Tanzania prior to the 2015 data collection. Before the interviews, written informed consent was obtained from all participants. For illiterate population, a written consent form was presented orally to them in the presence of legally authorized representative or witness such as a family member, friend, or someone independent of the research team. A parent or guardian provided consent for the child or adolescent to be involved in the study. Interviews were performed as privately as possible with each eligible respondent interviewed in the absence of another person.
Prevalence of child low birth weight (LBW) among adolescent and non-adolescent mothers
Overall, 14.3% of adolescents and 6.3% of non-adolescent mothers gave birth to low-birth-weight babies (Table 1). By education level, 19% of adolescent mothers with no education had a low-birth-weight babies compared to 7.1% of non-adolescent mothers. The proportion of women who gave birth to LBW babies were very similar across age group and economic status but a bit higher among unemployed adolescent mothers. Urban community appears to have higher proportion of mothers who gave birth to LBW babies, 15.5% for adolescent mothers and 6.9% for adult’s mothers when compared to those located in the rural settings. Twenty-two percent of divorced/separated or widowed adolescent mothers gave birth to LBW babies compared 9.5% found among adult women. Twenty-four percent of the undernourished adolescent mothers gave birth to LBW babies as compared to 10.4% of undernourished adult mothers.
Prevalence of child stunting among adolescent and non-adolescent mothers
The proportion of stunted children born by adolescent and non-adolescent mothers was 30.6 and 34.2% respectively (Table 2). Thirty-eight percent of under-five children born by women who have not been to school or with primary level of education were stunted. Over 30 % of children born by mothers living in rural community or within the lower social economic group were stunted. The proportion of stunted children by marital status was very similar, ranging from 25.8 to 32.3% among those born by divorced or separated adolescent women and from 32.2% among those never married to 39.4% among divorced or separated non-adolescent women. Thirty four percent of the under-five stunted children were born by adolescent mothers who were overweight or obese as compared to 26.6% of adult mothers. Adult mothers who were ever attended ANC visit had high percentage (33.9%) of stunted children as compared to adolescent mothers (28.7%).
Predictors of low birth weight
This analysis was conducted in a sample of 6385 women that had a live birth five years preceding the survey and weight data for their most recent child aged. Maternal age (adolescent and non-adolescent mothers) was considered as a main exposure as explain in the method section. Overall, non-adolescent mothers have reduced odds of giving birth to LBW babies when compared to adolescent mothers in both univariate and multivariate analysis. The odds of delivering a LBW babies decreases from 0.41 (95% CI: 0.29–0.57) in crude analysis to 0.34 (95% CI: 0.22–0.50) in adjusted analysis (Table 3). Maternal BMI, marital status and attending at least four ANC visit were significantly associated with LBW. The proportion of LBW babies was higher among mothers with primary education (66.5%), married or living with their partner (71.6%) and those with low socioeconomic status (51.1%).
Predictors of stunting in under-five children
A total of 8852 women with a live birth 5 years preceding the survey who had their height and age measurement documented in the dataset were considered in this analysis. As for LBW analysis, maternal age was considered as the main exposure while controlling for maternal factors: age, education, wealth index, marital status, place of residence, occupation and nutrition status and child characteristics: Birth weight, sex and age in the model. Although, 34.2% of children born by non-adolescent mothers were stunted compared to 30.6% of adolescent mothers, the adjusted analysis did not show any significant difference between these two age groups, AOR: 0.97 (95% CI: 0.73–1.29) (Table 4).
In a multivariate analysis, socioeconomic status (SES) was significantly associated with childhood stunting (AOR = 0.69; 95% CI: 0.57–0.84) with children found in higher socioeconomic group having higher odds of being stunted compared to those in lower socioeconomic group. Children born with low birth weight were 2.4 times more likely to be stunted (95% CI: 1.80–3.20) compared to those born with normal birth weight. Female children were less likely to be stunted (AOR = 0.77; 95% CI: 0.67–0.89) when compared to male. Also, children whose age were beyond 1 year had 3 times high odds of being stunted as compared to those with less than 1 year. Further, maternal body structure was significantly associated with child stunting. Children born with overweight or obese mothers had reduced odds of being stunted (AOR = 0.77; 95% CI: 0.64–0.92) when compared to mothers with normal BMI (Table 4).
This study explored factors associated with variation in proportional of Lower Birth Weight babies and stunted children among adolescent and non-adolescent mothers. Our findings showed that adolescent mothers have increased odds of giving birth to LBW babies with no difference in the likelihood of having a stunted child between these two maternal age groups. Unplanned pregnancies, biological immaturity, poor nutrition status during pregnancy are among factors that aggravated to LBW among adolescent mothers . We also found significant increase in risk of LBW to mothers who were divorced/separated/widowed compared to those married. This is similar to the finding reported by Tessema et al. , on a study conducted in sub-Saharan Africa and contradict with the studies conducted by Talie et al. , and Tshotetsi et al. , who found no significant association between marital status and LBW. Lack of social and economic support and stress have been reported as factors associated with delivering LBW infants among single and separated/divorced/widowed mothers . This study found significantly high odds of LBW among undernourished mother as compared to normal ones, a finding similar to that of studies conducted in India  and Ethiopia . Factors like poor socio-economic status, unemployment, poor dietary intake and poor weight gain during pregnancy could be the ones associated with delivering LBW infants. Optimal nutrition is particularly critical for pregnant teens . According to WHO guideline a minimum of four ANC visits are required for safe maternity , our study has found mothers who attended at least four ANC had lower risk of delivering LBW infants compared to those who attended less than four ANC. This is similar to the finding from a study conducted in India by Priyanka D .
The findings showed that maternal age was not significantly associated with childhood stunting. Although children born to adult mothers have slightly high odds of being stunted compared to those belong to adolescent mothers. This finding look similar to that of Agedew et al., done in Ethiopia  but is contrary to the finding of Chirande et al., done in Tanzania  and Habyarimana et al., done in Rwanda . We found negative association between children whose mothers lived in high socioeconomic status and stunting. This is consistency to the study done in India and sub Saharan Africa [31, 34]. Household purchasing power, sanitation and health insurance are among factors that can contribute to poor or good nutrition status among under five children . Malnutrition is a condition that is associated with poverty since it comes with hunger and lack of food at the right quantity and quality [35,36,37]. Unlike the study conducted by Francois R. et al. , we found stunting is less among obese or overweight mother. In our finding, a unit increase in Body Mass Index, stunting among under-five children of obese or overweight mothers decreased by 23%. This is absolutely higher compared to what reported by Amaha N and Woldeamanuel B ; a unit increase in Body Mass Index reduced the odds of U-5 stunting by 4%.
We also looked an association between child characteristics (birth weight, sex and age) and stunting. Our findings showed that children who were born with LBW had two times high chance of being stunted compared to those born with normal weight. This is in line with the studies conducted in Rwanda, Indonesia and Ethiopia [38, 39]. LBW is a predisposing factor for growth attainment . Our study found, stunting in female children decreased by 23% as compared to male child. This agrees with studies conducted in Tanzania, Afghanistan and Ghana [40,41,42] which showed that boys were disadvantaged in term of stunting status than girls. Inadequate amount of food, culture preference and physical activeness might be the leading factors for stunting among male children compared to girls. We also found high odds of stunting as child age increases. This agrees with the study conducted in Tanzania  which showed that the risk of stunted increases as children approach their second year of life. Suboptimal breastfeeding (specifically, non-exclusive breastfeeding) and complementary feeding that is limited in quantity, quality and variety could be the factors that increases risk of stunting on children as age increases .
We found LBW was significantly associated with maternal age with adolescent mothers being at higher risk of giving birth to LBW babies as compared to non-adolescent mothers. Maternal ANC attendance and being divorced, separated or widowed were also showed significantly association with LBW. The findings also show stunting is not associated with maternal age even after controlling for socioeconomic status, maternal nutrition status and child characteristics (birth weight, sex and age). A multi-sectoral approach is needed in addressing child nutrition problems with teenagers ‘specific intervention that offer emotional support, and health education during pregnancies for improving immediate and later life child birth outcomes.
Limitation of the study
Variability in availability of birth weight data might have biased the results since only 64% of live births had birth weight measurement. The study has a sample of 13,266 women of which only 2904 were adolescent mothers. The unequal sample size by maternal age might have affected the statistical power of the study as some of the estimates may be over or under-reported. Since the this was secondary analysis of the data, some important clues might be missing concerning the causal relationship of dependent factors and outcome. For example, the study revealed out that boys were more stunted than girls but the reasons behind this are incomprehensive. The detailed list of strength and weakness of the DHS dataset have been documented by Corsi et al. .
Clinical implications of the study
The finding reflects the needs of a multi-sectoral approach in addressing child nutrition problems with teenagers ‘specific intervention that offer emotional support, and health education before and during pregnancies for better child birth outcomes. Stakeholders and policy makers are likely to use these findings for changing policies and designing of community related intervention that target adolescent and non-adolescent mothers.
Availability of data and materials
The study datasets are available from the DHS website through (https://dhsprogram.com/data/available-datasets.cfm).
Body Mass Index
Demographic and Health Survey
Low Birth Weight
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Tanzania Demographic and Health Survey
Tanzania National Nutritional Survey
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We acknowledge the financial support from the African development Bank (AfDB) through its project as part of the first author’s scholarship at Nelson Mandela African Institute of Science and Technology. We also appreciate the support we received from Prof. A. Mkopi (IHI) during proposal writing. Finally, we thank the WHO for giving us permission to access online and use the dataset for the aim of research.
This research and publication of the article were funded by the African Development Bank project as part of the first author’s scholarship at Nelson Mandela African Institute of Science and Technology.
Ethics approval and consent to participate
Protocol, study procedures and questionnaires for DHS surveys was reviewed and approved by Institutional Review Board (IRB) and by the National Institute Medical Research committee. Before the interviews, written informed consent was obtained from all participants. A parent or guardian provided consent for the child or adolescent to be involved in the study. Interviews were performed as privately as possible with each eligible respondent interviewed in the absence of another person.
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Mtongwa, R.H., Festo, C. & Elisaria, E. A comparative analysis of determinants of low birth weight and stunting among under five children of adolescent and non-adolescent mothers using 2015/16 Tanzania Demographic and Health Survey (TDHS). BMC Nutr 7, 64 (2021). https://doi.org/10.1186/s40795-021-00468-6
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