Baseline characteristics of comparison and intervention groups1-150
| Characteristic | Comparison group (n=119) | Intervention group (n=114) |
| Mean (SD) age (years) | 23.2 (7.3) | 24.6 (5.7) |
| Mean (SD) weeks pregnant | 13.9 (6.6) | 14.9 (6.6) |
| Mean (SD) cigarettes/day in previous 7 days | 9.8 (8.3) | 10.0 (13.4) |
| Education (% completing grade 12) | 70.1% | 77.2% |
| Race (%white) | 73.7% | 82.2% |
↵1-150 No significant differences were found between groups at baseline.