TABLE 4.
Trend analysis for mode of delivery by obesity class
| Variable | Body mass index, n (%) | P valuea | ||
|---|---|---|---|---|
| 30–39.9 kg/m2 | 40–49.9 kg/m2 | ≥50 kg/m2 | ||
| Nulliparous pregnancy | ||||
| Vaginal delivery | 9042 (53.2) | 1331 (44.5) | 94 (31.8) | < .0001 |
| Operative vaginal delivery | 1747 (10.3) | 268 (9.0) | 24 (8.1) | .0471 |
| Primary scheduled cesarean delivery | 3033 (17.8) | 654 (21.9) | 100 (33.8) | < .0001 |
| Primary emergency cesarean delivery | 3163 (18.6) | 735 (24.6) | 78 (26.4) | < .0001 |
| Multiparous pregnancy | ||||
| Vaginal delivery | 22,334 (62.5) | 3690 (52.8) | 421 (47.6) | < .0001 |
| Operative vaginal delivery | 1343 (3.8) | 272 (3.9) | 39 (4.4) | .3187 |
| Vaginal birth after cesarean delivery | 735 (2.1) | 150 (2.2) | 23 (2.6) | .3073 |
| Primary scheduled cesarean delivery | 1382 (3.9) | 328 (4.7) | 46 (5.2) | .0003 |
| Primary emergency cesarean delivery | 1400 (3.9) | 323 (4.6) | 49 (5.5) | .0004 |
| Repeat scheduled cesarean delivery | 8559 (23.9) | 2229 (31.9) | 307 (34.7) | < .0001 |
| Totals | ||||
| Vaginal delivery | 31,534 (59.5) | 5053 (50.3) | 517 (43.6) | < .0001 |
| Operative vaginal delivery | 3108 (5.9) | 548 (5.5) | 63 (5.3) | .0837 |
| Cesarean delivery | 17,653 (33.3) | 4304 (42.8) | 582 (49.1) | < .0001 |
| Primary scheduled | 4452 (8.4) | 992 (9.9) | 147 (12.4) | < .0001 |
| Primary emergency | 4580 (8.6) | 1067 (10.6) | 127 (10.7) | < .0001 |
a
Cochran-Armitage χ2 trend test.
Marshall. Maternal superobesity and perinatal outcomes. Am J Obstet Gynecol 2012.