Table 2 Pregnancy, labour and delivery characteristics of women in each BMI group
From: Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies
Characteristics | Underweight BMI < 20 n = 2842 | Normal BMI = 20–24.9 n = 14076 | Overweight BMI = 25–29.9 n = 5308 | Obese BMI = 30–34.9 n = 1858 | Morbidly Obese BMI > 35 n = 157 |
|---|---|---|---|---|---|
Pre-eclampsia* | 82(3.3%) | 572(5.0%) | 313(8.1%) | 181(14.7%) | 29(28.2%) |
Gestational hypertension* | 374(13.6%) | 2662(19.7%) | 1422(28.5%) | 624(37.2%) | 54(42.2%) |
Abruptio placentae | 12(0.4%) | 83(0.6%) | 31(0.6%) | 13(0.7%) | 3(1.9%)* |
Placenta praevia | 10(0.4%) | 25(0.2%) | 11(0.2%) | 3(0.2%) | 0(0%) |
Induced labour* | 683(24.0%) | 3832(27.2%) | 1771(33.4%) | 796(42.8%) | 77(49.0%) |
Instrumental delivery | 773(27.2%) | 4040(28.7%) | 1499(28.2%) | 465(25.0%) | 38(24.2%) |
Total C-Section* | 320(11.3%) | 2305(16.4%) | 1279(24.1%) | 573(30.8%) | 67(42.7%) |
Elective C-section | 73(2.6%) | 487(3.5%) | 221(4.2%) | 88(4.7%)* | 16(10.2%)* |
Emergency CS* | 247(8.7%) | 1818(12.9%) | 1058(19.9%) | 488(26.3%) | 51(32.5%) |
Mean blood loss (mls)* | 254.5 (6.9) | 290.4 (5.7) | 333.6(8.5) | 400.5(7.2) | 456.4(25.7) |
Postpartum haemorrhage* | 192(6.8%) | 1356(9.5%) | 708(13.3%) | 369(19.9%) | 37(23.6%) |
Preterm delivery (< 37 weeks) | 345(12.1%)* | 1537(10.9%) | 573(10.8%) | 243(13.1%)* | 32(20.4%)* |
Preterm delivery (< 33 weeks) | 58(2.0%) | 331(2.4%) | 122(2.3%) | 77(4.1%)* | 10(6.4%)* |
Spontaneous preterm(< 37 wks) | 244(8.5%)* | 964(6.8%) | 325(6.1%) | 124(6.6%) | 12(7.6%)* |
Post term delivery (> 41 weeks) | 108(3.8%)* | 773(5.5%) | 350 (6.6%)* | 136(7.3%)* | 7(4.5%) |
Stillbirth | 22(0.8%) | 131(0.9%) | 57(1.1%) | 35(1.9%)* | 4(2.5%)* |
Birth weight < 2500 g | 269(9.5%)* | 980(7.0%) | 327(6.2%) | 142(7.6%) | 19(12.1%)* |
Birth weight > 4000 g* | 100(3.5%) | 1072(7.6%) | 564(10.6%) | 255(13.7%) | 25(15.9%) |