Obstetric and neonatal outcomes among women who have or have not undergone assisted human reproduction (AHR) treatment
| Characteristic | No. (%) of live births* | p (GEE) | |
|---|---|---|---|
| Non-AHR n = 492 023 | AHR n = 26 270 | ||
| Mode of delivery | |||
| Spontaneous vaginal birth | 184856 (37.6) | 6221 (23.7) | 0.327 |
| Induced labour | 91355 (18.6) | 4661 (17.7) | 0.424 |
| Cesarean delivery | 114581 (23.3) | 10643 (40.5) | < 0.001 |
| Missing | 101231 (20.6) | 4745 (18.1) | 0.51 |
| Preterm delivery (< 37 wk) | 45050 (9.2) | 8156 (31).0 | < 0.001 |
| Prolonged pregnancy (≥ 42 wk) | 1252 (0.3) | 26 (0.1) | – |
| Birth weight, g, mean ± SD | 3320 ± 575 | 3020 ± 762 | < 0.001 |
| Median (IQR) | 3350 (3010–3674) | 3130 (2635–3520) | |
| Birth weight category, kg | |||
| < 2.5 | 37179 (7.6) | 7058 (26.9) | < 0.001 |
| 2.5–4.0 | 405333 (82.4) | 17767 (67.6) | 0.171 |
| > 4.0 | 43707 (8.9) | 1368 (5.2) | < 0.001 |
| Missing | 5804 (1.2) | 77 (0.3) | – |
| Neonatal intensive care unit admission | 47936 (9.7) | 6651 (25.3) | < 0.001 |
| Congenital malformation | 1410 (0.3) | 134 (0.5) | 0.002 |
Note: GEE = generalized estimating equation, IQR = interquartile range, SD = standard deviation.
↵* Unless indicated otherwise.