List of the data collected for each of the subsets, and the associated denominators.

aBefore initiating analysis data exploration (not shown) was carried out to compare the entire cohort of all enrolled children to the subset of children with available information from Health and Demographic Surveillance System data and no differences were noted.bFor the multivariable logistic regression model, n = 84 for children who died and n = 781 for children who survived due to missing data.