Possible causalities between malnutrition and academic performances among primary schoolchildren: a cross-sectional study in rural Madagascar

BACKGROUND: The importance of addressing malnutrition is increasing in the context of children’s health and their academic performances. Childhood malnutrition further could reduce a country’s economic productivity. No earlier study adequately estimated the causalities between schoolchildren’s malnutrition and their academic performances. How nutritional status contributes to children’s academic performances has never been reported from Madagascar. This study aims to estimate the possible causalities between their nutritional status and academic performances in rural Madagascar. METHODS: A cross-sectional household survey was conducted in Antananarivo-Avaradrano district, Madagascar, from November to December 2017, by targeting 404 first and second graders 5–14 years of age enrolled in 10 public primary schools. Children’s anthropometric measurements and structured interviews with their mothers/caregivers were conducted. Children’s academic performances data (mathematical and national language proficiencies) were collected at each school. To estimate associations between their malnutrition and academic performances, bivariate and multivariate analyses were conducted. To estimate their possible causalities between them, three conditions were examined (crude covariational relationship, covariational relationship through controlling for a third variable and temporal precedence). RESULTS: Four independent variables produced significantly positive coefficients with mathematical proficiency in multivariate analysis. Of the four, ‘not being stunted’ and ‘attendance rate’ were estimated to be possible causes of higher mathematical proficiency because they satisfied all the three conditions for a causality. On the other hand, three independent variables produced significantly positive coefficients with national language proficiency in multivariate analysis. Yet, none of them were estimated to be possible causes of higher national language proficiency. CONCLUSIONS: A hypothetical causal path indicates that ‘not being stunted’ is likely to have caused higher ‘attendance rate’ and thereby higher ‘mathematical proficiency’ in a two-step manner. This study is the first attempt to estimate the possible causalities between schoolchildren’s nutritional status and their academic performances in Madagascar.