Source of prenatal care and infant birth weight: the case of a North Carolina county.

The impact of a comprehensive prenatal care program on the birth weights of infants born to low-income women is assessed. Women receiving care through the prenatal program of a large county public health department were compared to pregnant Medicaid-eligible women in the same county, who received prenatal care primarily from private-practice physicians. The percentage of low birth weight was 8.3 for the health department women compared with 19.3 for the Medicaid women. After differences between the two groups in race, marital status, participation in the Special Supplemental Food Program for Women, Infants, and Children (WIC), quantity of prenatal care, and other risk factors were statistically controlled, the chance of a Medicaid woman having a low-weight birth was still more than twice as great (p = 0.007). A case-management approach and greater use of services ancillary to basic obstetric medical care appear to contribute to the better birth weight outcomes in the health department.