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Average number of daily cigarettes by time point.
| Time | Pregnant | Nonpregnant | |
|---|---|---|---|
| Mean (SD) | Mean (SD) | P | |
| Prior to intervention | 18.8 (10.1) | 13.2 (1.0) | 0.003 |
| Week 1 intervention | 15.2 (13.8) | 12.4 (1.1) | 0.2 |
| Week 6 (end intervention) | 8.3 (6.5) | 9.3 (5.6) | 0.4 |
| 1-month followup | 8.3 (5.9) | 8.6 (5.9) | 0.8 |
| 3-month followup | 7.9 (7.5) | 8.5 (6.4) | 0.7 |
