Pooled time-series cross-section regressions were used to examine the effects of the Medicaid eligibility expansions in 15 states on rates of abortions and births among unmarried women aged 19-27 with 12 or fewer years of schooling. Abortion data came from the National Center for Health Statistics or state health departments and were aggregated by women's age, race, marital status and schooling; data on births were from national natality tapes.