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Within-Individual Analyses of Rates of Drug Abuse in the Pre-Pregnancy and Post-Partum Periods
| Risk Period | N | Prevalence of Drug Abuse during the |
Odds Ratio (95% Confidence Interval) |
|
|---|---|---|---|---|
| Control Period |
Risk Period |
|||
| 0–242 days after childbirth | 126,586 | 0.65% | 0.14% | 0.13 (0.11–0.16) |
| 243–484 days after childbirth | 110, 067 | 0.66% | 0.16% | 0.15 (0.10–0.18) |
| 485–726 days after childbirth | 93,799 | 0.66% | 0.22% | 0.23 (0.19–0.28) |
All control periods − 242 days prior to birth
