Obstetric complications by maternal body mass index

Outcome	Control (%) (n = 13,752)	Obese* (%) (n = 1473)	Severe obesity^¶ (%) (n = 877)
Gestational hypertension	4.8	10.2	12.3
Preeclampsia	2.1	3.0	6.3
Gestational diabetes	2.3	6.3	9.5
Preterm prelabor rupture of membranes	1.7	2.1	2.2
Preterm birth	3.3	4.0	5.5
Fetal growth restriction	1.1	1.0	0.8
Birth weight >4000 g	8.3	13.3	14.6
Birth weight >4500 g	1.0	2.1	2.6
Placenta previa	0.6	0.8	0.5
Placental abruption	0.8	0.8	0.8
Operative vaginal birth	10.5	8.5	11.1

* Body mass index 30 to 34.9 kg/m².

¶ Body mass index ≥35 kg/m².

Modified from: Weiss JL, Malone FD, Emig D, et al. Obesity, obstetric complications, and cesarean delivery rate: A population-based screening study. Am J Obstet Gynecol 2004; 190:1091.

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Obstetric complications by maternal body mass index