Objective: The United Nations Human Development Index (HDI) is a compo
site index of life expectancy, literacy, and per capita gross domestic
product that measures the socioeconomic development of a country. We
estimated infant and maternal mortality rates in the world and assesse
d how well the HDI and its individual components predicted infant and
maternal mortality rates for individual countries. Materials: Data on
mortality rates and values for HDI components were obtained from the U
nited Nations and the World Bank. Results: For the 1987 to 1990 period
, approximately 9 million infant deaths and 349, 000 maternal deaths o
ccurred in the world annually, yielding global infant and maternal mor
tality rates of 67 per 1000 and 250 per 100,000 live births, respectiv
ely. HDI is a powerful predictor of both infant and maternal mortality
rates. It accounts for 85% to 92% of the variation in infant mortalit
y rates, and 82% to 85% of the variation in maternal mortality rates a
mong countries. Each component of HDI is also strongly correlated with
both infant and maternal mortality rates (significance of all values
for r, p < 0.001), and eliminating life expectancy from HDI does not d
ecrease significantly the predictive power of HDI for infant or matern
al mortality rates. Conclusion: HDI is not only a useful measure for s
ocioeconomic development, but also a powerful predictor of infant and
maternal mortality rates for individual countries.