Table 4 Neonatal outcomes in live birth cycles stratified by the ovarian stimulation method
| Â | Natural | Letrozole | P-value |
|---|---|---|---|
Live birth, n | 746 | 808 | Â |
Female age | 35.5 ± 0.1 | 35.6 ± 0.1 | 0.6882 |
Male age | 37.8 ± 0.2 | 37.5 ± 0.2 | 0.2048 |
Body mass index | 20.6 ± 0.1 | 20.8 ± 0.1 | 0.1734 |
Pregnancy complications, n (%) | 37 (5.0) | 52 (6.4) | 0.2110 |
Hypertensive disorders of pregnancy, n (%) | 8 (1.1) | 3 (0.4) | 0.0996 |
Gestational diabetes mellitus, n (%) | 4 (0.5) | 7 (0.9) | 0.4380 |
HELLP syndrome, n (%) | 0 (0) | 1 (0.1) | 0.3365 |
Preterm premature rupture of membrane, n (%) | 1 (0.1) | 4 (0.5) | 0.2093 |
Low-lying placenta, n (%) | 4 (0.5) | 4 (0.5) | 0.9099 |
Placenta previa, n (%) | 9 (1.2) | 10 (1.2) | 0.9554 |
Placental abruption, n (%) | 1 (0.1) | 2 (0.3) | 0.6107 |
Others, n (%) | 1 (0.1) | 2 (0.3) | 0.6107 |
Caesarean section rate, n (%) | 220 (29.5) | 216 (26.7) | 0.2267 |
Gestational age, weeks | 39.0 ± 0.1 | 39.0 ± 0.1 | 0.6539 |
Preterm delivery (< 37 weeks), n (%) | 40 (5.4) | 45 (5.6) | 0.8575 |
Birth length (cm) | 49.1 ± 0.1 | 49.0 ± 0.1 | 0.7309 |
Birth weight (g) | 3,031 ± 16 | 3,017 ± 15 | 0.5208 |
Low birth weight (< 2,500 g), n (%) | 66 (8.9) | 72 (8.9) | 0.9648 |
Small for gestational age | 31 (4.2) | 34 (4.2) | 0.9589 |
Large for gestational age | 126 (16.9) | 116 (14.4) | 0.1688 |
Infant sex | Â | Â | 0.9515 |
Male, n (%) | 388 (52.0) | 419 (51.9) | Â |
Female, n (%) | 358 (48.0) | 389 (48.1) | Â |
Birth defect, n (%) | 31 (4.2) | 36 (4.5) | 0.7755 |