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[Socioeconomic inequalities and low birth weight and perinatal mortality in Rio de Janeiro, Brazil].

Socioeconomic inequalities in early infant mortality have been evidenced in Brazil, with a greater mortality risk associated with the mother's socioeconomic status (SES). The aim of this paper is to identify socioeconomic inequalities in relation to low birth weight and perinatal mortality in the City of Rio de Janeiro, Brazil, discussing the appropriateness of the main health inequality indexes proposed in the international literature. As the information source, we use data collected in a survey of approximately 10,000 mothers selected for interview within 48 hours after delivery in public and private hospitals in the city. Using educational level and head of household's income as indicators of SES, as well as population attributable risk and slope index of inequality as health inequality measures, the results show a steep socioeconomic gradient in the proportion of low birth weight, and especially in the perinatal mortality rate. The persistent association between socioeconomic indicators and adverse results in pregnancy indicates (at least partially) the health system's inefficacy in diminishing perinatal health inequalities in Rio de Janeiro.