Primary outcomes
| A | B | A–B | C | A–C | |
|---|---|---|---|---|---|
| Bup/Nalox (n=62) | No opioids (n=618) | p Value | Illicit opioids (n=159) | p Value | |
| Primary outcomes | |||||
| Preterm delivery, n (%)‡ | 2 (3.2%) | 26 (4.21%) | >0.999† | 7 (4.4%) | >0.999† |
| Birth weight (g), mean±SD‡ | 3541±540 | 3553±569 | 0.924* | 3274±551 | <0.001* |
| Congenital anomalies, n (%) | 2 (3.2%) | 5 (0.8%) | 0.127† | 0 | 0.078† |
| Stillbirths | 0 | 5 (0.8%) | >0.999† | 1 (0.6%) | >0.999† |
*χ2 test was used.
†When assumptions for the χ2 test were not met, the Fisher's Exact test was used.
‡Birth weight and gestational age were limited to live births that were >500 g and >20 weeks.