Abstract
SummaryData from pregnancy histories collected by the 1976–77 Mexican Fertility Survey show wide variations in infant mortality among a sample of 125 communities. There are also large infant mortality differentials by population size, economic status, access variables, utilities, medical facilities and schools. These community-level factors, which have been little used in previous studies, are highly correlated and do not appear to affect infant survival independently of population size. As such, community size serves as a summary measure of a locality's overall level of development and comparative risk of early death for its young inhabitants.
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