Odds ratios of perinatal problems of IVF infants compared with naturally conceived children, by plurality
| Infant outcome | Single | Multiple | ||
|---|---|---|---|---|
| OR | Adjusted OR | OR | Adjusted OR | |
| S, singletons; M, multiples | ||||
| Gestation length <37 weeks | 1.70 (1.50 to 1.92) | 1.84 (1.62 to 2.10) | 1.28 (1.13 to 1.46) | 1.21 (1.07 to 1.36) |
| Birth weight <2500 g | 1.64 (1.42 to 1.89) | 1.67 (1.43 to 1.95) | 1.24 (1.09 to 1.42) | 1.00 (0.89 to 1.14) |
| Perinatal mortality | 1.58 (1.06 to 2.35) | 1.33 (0.88 to 1.99) | 0.79 (0.69 to 1.90) | 0.80 (0.53 to 1.20) |
| Major congenital anomaly | 1.52 (1.25 to 1.84) | 1.30 (1.05 to 1.61) | 0.81 (0.52 to 1.27) | 0.80 (0.48 to 1.32) |