Table 1 Maternal and neonatal characteristics grouped by prepregnancy BMI.
Underweight N = 344 | Normalweight N = 1973 | Overweight N = 475 | Obesity N = 65 | F/χ2 | P value | |
|---|---|---|---|---|---|---|
Maternal age (years), mean ± SD | 29.2 ± 3.7 | 30.8 ± 3.7 | 31.6 ± 4.0 | 32.4 ± 3.8 | 29.453 | < 0.001 |
Maternal age (years) ≥ 35 | 25 (7.3) | 307 (15.6) | 99 (20.8) | 18 (27.7) | 35.935 | < 0.001 |
Nulliparity | 287 (83) | 1699 (86.1) | 378 (79.6) | 51 (78.4) | 14.831 | 0.002 |
Dichorionic | 268 (78) | 1663 (84.2) | 417 (87.8) | 57 (87.7) | 15.430 | 0.001 |
Monochorionic | 71 (21) | 304 (15.4) | 50 (10.5) | 7 (10.8) | 17.062 | 0.001 |
Unknown chorionicity | 5 (1.5) | 6 (0.3) | 8 (1.7) | 1 (1.5) | 14.535 | 0.002 |
Past preterm birth | 3 (0.9) | 5 (0.2) | 1 (0.2) | 0 (0) | 4.009 | 0.261 |
Past cesarean delivery | 27 (7.8) | 160 (8.1) | 65 (13.7) | 15 (23.1) | 29.488 | < 0.001 |
Assisted reproductive technology (ART) | 207 (60.2) | 1379 (69.9) | 361 (76) | 50 (76.9) | 25.389 | < 0.001 |
Gestational diabetes mellitus(GDM) | 55 (16) | 496 (25.1) | 177 (37.2) | 32 (49.2) | 66.707 | < 0.001 |
Gestational hypertension (GH) | 16 (4.7) | 68 (3.4) | 15 (3.2) | 7 (10.8) | 10.708 | 0.013 |
Preeclampsia (PE) | 38 (11) | 279 (14.1) | 94 (19.8) | 19 (29.2) | 24.156 | < 0.001 |
Fetal growth restriction(FGR) | 26 (7.4) | 119 (6.0) | 21 (4.4) | 4 (6.2) | 3.602 | 0.308 |
Premature rupture of membranes (PROM) | 71 (20.1) | 398 (20.2) | 86 (18.1) | 13 (20) | 1.170 | 0.760 |
Gestational weeks(w) at birth | ||||||
≥ 36w | 213 (62) | 1271 (64.4) | 313 (65.9) | 32 (49.2) | 7.693 | 0.053 |
34–36w | 69 (20) | 434 (22) | 89 (18.7) | 19 (29.2) | 5.161 | 0.160 |
32–34w | 39 (11) | 153 (7.8) | 35 (7.3) | 9 (13.8) | 8.138 | 0.043 |
28–32w | 16 (4.7) | 88 (4.5) | 27 (5.7) | 3 (4.6) | 1.285 | 0.733 |
< 28w | 7 (2) | 27 (1.4) | 11 (2.3) | 2 (3.1) | 3.400 | 0.334 |
