Table 4.
Univariable and multivariable linear regression analyses for neonatal birthweight (g)
| RC (95% CI) | p value | aRC (95% CI) | p value | |
|---|---|---|---|---|
| Maternal age (per year) | 10.47 (− 8.14, 29.09) | 0.270 | − 2.11 (− 17.65, 13.42) | 0.790 |
| Maternal BMI (per kg/m2) | 14.91 (− 2.06, 31.88) | 0.085 | 11.81 (− 2.17, 25.78) | 0.098 |
| Maternal smoking | ||||
| No | Reference | Reference | ||
| Yes | − 162.00 (− 382.36, 58.36) | 0.150 | − 219.03 (− 400.91, − 37.15) | 0.018 |
| Maternal parity | ||||
| Nulliparous | Reference | Reference | ||
| Multiparous | 126.02 (− 44.84, 296.87) | 0.148 | 133.20 (− 10.50, 276.90) | 0.069 |
| Embryo transfer day | ||||
| Day 3 | Reference | Reference | ||
| Day 5 | − 41.09 (− 183.19, 101.00) | 0.571 | − 88.49 (− 204.29, 27.32) | 0.134 |
| Gestational age (per day) | 27.73 (22.46, 32.99) | 0.000 | 28.05 (22.83, 33.28) | 0.000 |
| Liveborn gender | ||||
| Female | Reference | Reference | ||
| Male | 62.27 (− 80.38, 32.99) | 0.392 | 48.11 (− 68.92, 165.14) | 0.420 |
RC, regression coefficient; aRC, adjusted regression coefficient (with all variables presented included in the model)