Abstract
Background/Objective:
The role of micronutrients particularly zinc in childhood diarrhoea is well established. Immunomodulatory functions of vitamin-D in diarrhoea and its role in the effect of other micronutrients are not well understood. This study aimed to investigate whether vitamin-D directly associated or confounded the association between other micronutrient status and diarrhoeal incidence and severity in 6–24-month underweight and normal-weight children in urban Bangladesh.
Subjects/Methods:
Multivariable generalised estimating equations were used to estimate incidence rate ratios for incidence (Poisson) and severity (binomial) of diarrhoea on cohorts of 446 normal-weight and 466 underweight children. Outcomes of interest included incidence and severity of diarrhoea, measured daily during a follow-up period of 5 months. The exposure of interest was vitamin-D status at enrolment.
Results:
Normal-weight and underweight children contributed 62 117 and 62 967 day observation, with 14.2 and 12.8 days/child/year of diarrhoea, respectively. None of the models showed significant associations of vitamin-D status with diarrhoeal morbidity. In the final model, zinc-insufficient normal-weight children had 1.3 times more days of diarrhoea than sufficient children (P<0.05). Again zinc insufficiency and mother's education (1–5 and >5 years) had 1.8 and 2.3 times more risk of severe diarrhoea. In underweight children, older age and female had 24–63 and 17% fewer days of diarrhoea and 52–54 and 31% fewer chances of severe diarrhoea.
Conclusion:
Vitamin-D status was not associated with incidence and severity of diarrhoea in study children. Role of zinc in diarrhoea was only evident in normal-weight children. Our findings demonstrate that vitamin-D is not a confounder of the relationship between zinc and diarrhoea.
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Acknowledgements
The Aetiology, Risk Factors and Interactions of Enteric Infections and Malnutrition and the Consequences for Child Health and Development Project (MAL-ED) is carried out as a collaborative project supported by the Bill and Melinda Gates Foundation, the Foundation for the NIH and the National Institutes of Health, Fogarty International Center.
Author contributions
AMSA, RJSM, TA, KL and AM conceived and designed the study; AMSA, TA, MM, MI, IH, AG, AS, RH, RG and WP oversaw data collection; AMSA, RJSM, KL and AM analysed the data; AMSA, RJSM, TA, KL, MM, MI, IH, AG, AS, RH, RG, WP and AM interpreted the data; AMSA drafted the manuscript; AMSA, RJSM, TA, KL and AM contributed to redrafting the manuscript.
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Ahmed, A., Magalhaes, R., Ahmed, T. et al. Vitamin-D status is not a confounder of the relationship between zinc and diarrhoea: a study in 6–24-month-old underweight and normal-weight children of urban Bangladesh. Eur J Clin Nutr 70, 620–628 (2016). https://doi.org/10.1038/ejcn.2016.7
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DOI: https://doi.org/10.1038/ejcn.2016.7