Relative risk of very low birth weight (<1500 g) among cohort mothers, adjusting for age group and race
| Variables in model | All county births (model 1) | All non-Medicaid county births (model 2) | County Medicaid births only (model 3) |
| Cohort v county4-150 | 0.44 (0.23, 0.85) | 0.46 (0.23, 0.89) | 0.32 (0.16, 0.63) |
| Blackv other4-150 | 2.56 (2.14, 3.06) | 2.94 (2.31, 3.74) | 1.66 (1.26, 2.18) |
| Age group | |||
| 15–194-150 | 1.0 | ||
| 20–24 | 1.06 (0.72, 1.56) | 1.03 (0.45, 2.35) | 1.04 (0.67, 1.63) |
| 25–29 | 1.03 (0.71, 1.49) | 0.95 (0.43, 2.08) | 1.10 (0.70, 1.75) |
| 30–34 | 1.03 (0.72, 1.49) | 0.89 (0.41, 1.94) | 1.52 (0.96, 2.41) |
| 35–39 | 1.04 (0.70, 1.56) | 0.90 (0.40, 2.00) | 1.56 (0.89, 2.74) |
| 40–44 | 1.73 (1.00, 2.97) | 1.69 (0.69, 4.14) | 1.51 (0.53, 4.31) |
↵4-150 Indicates reference group.