LAUSR

Background Adolescent girls are vulnerable to undernutrition owing to their increased nutrition demand for growth and development, including sexual development and maturation. Despite its public health importance, undernutrition among late adolescent girls has received little attention in health and nutrition policies. Although undernutrition in adolescent girls has been investigated, most of the previous study reports were based on small sample sizes and limited geographic settings. Therefore, we aimed to estimate the prevalence and determinants of undernutrition among late adolescent girls in East Africa. Methods Secondary data analysis was conducted among 10 East African countries using the most recent Demographic and Health Survey (DHS) reports. A total of 21,779 adolescent girls aged 15–19 years were included in this study. Descriptive statistics were conducted to describe the study population. The binary logistic regression model was fitted to identify the determinants of undernutrition among late adolescent girls. Variables with a p-value of <0.05 in the multivariate analysis were identified as statistically significant determinants of undernutrition. Results The overall magnitude of undernutrition among late adolescent girls in East Africa was 16.50% (95% CI: 16.00–17.00), whereas the overall magnitude of obesity among late adolescent girls in East Africa was 2.41% (95% CI: 2.21–2.62). In the final model of the multivariate analysis, adolescent girls aged 18–19 years [adjusted odds ratio (AOR) = 0.55; 95% CI: 0.51–0.60], having secondary education (AOR = 0.79; 95% CI: 0.68–0.93), being from a rich wealth index family (AOR = 0.63; 95% CI: 0.56–0.69), and being from a medium wealth index family (AOR = 0.80; 95% CI: 0.72–0.89) were negatively and statistically associated with undernutrition. Likewise, having more than seven household members (AOR = 1.36; 95% CI: 1.10–1.67), walking more than 30 min to a water source (AOR = 1.10; 95% CI: 1.01–1.20), and living in Ethiopia (AOR = 1.75; 95% CI: 1.51–2.03) were positive determinants of undernutrition among late adolescent girls. Conclusion In this study, undernutrition in late adolescent girls remains a considerable public health problem in East Africa. Age group, educational status, marital status, family wealth index, family size, time taken to reach a water source, media exposure, and country of resident were significant determinants of undernutrition. Therefore, devising strategies that improve the socioeconomic status of households and/or adolescents would help to reduce the risks of undernutrition in late adolescents.