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This study was undertaken to determine whether the age of pregnant Black women with sickle cell trait (AS) influences pregnancy outcome. We retrospectively collected anthropometric, obstetrical and neonatal data from 157 trait and 213 nontrait (AA) lower socioeconomic class, primiparous Black women (14 to 28 years of age) who had delivered at our medical center. These groups were subdivided into adolescents (14-16 years) and adults (17-28 years) for purposes of statistical compari­son. No differences in general body size were found but AS women in general had higher rates of contracted pelves than their AA peers (statistically significant for adults). Also adult AS women had neonates with significantly lower mean birth weights than adult AA women