[Use of the modified Kotelchuck index in the evaluation of prenatal care and its relationship to maternal characteristics and birth weight in Rio de Janeiro, Brazil].

The Kotelchuck index (KI) was modified and used to evaluate prenatal care provided in the City of Rio de Janeiro, Brazil, in a sample of 9,920 post-partum women following singleton deliveries. Ordinal logistic regression (OLR) and multivariate linear regression (LMR) were used to estimate the importance of demographic, psychosocial, and obstetric factors for modified KI and the effects on birth weight (BW), respectively. Only 38.5% of the sample was classified as having received adequate or intensive prenatal care. After adjusting for other predictors, the explanatory variables for KI were: mother's schooling, living with the newborn's father, attempted abortion, diabetes mellitus, satisfaction with pregnancy, skin color, parity, age, and place of residence. BW was associated with the modified KI, even after controlling for socio-demographic, behavioral, and biological variables. Adequate utilization of prenatal care in the City of Rio de Janeiro contributed to the prevention of low BW, and the mothers who used prenatal services less presented worse conditions in terms of socioeconomic status, schooling, family support, and obstetric risk.