Total sample | No uterine rupture | Experienced uterine rupture a, b | ||||||
---|---|---|---|---|---|---|---|---|
N = 84,924 (100%) | N = 84,233 (99.19%) | N = 569 (0.67%) | ||||||
n | % | n | % | n | % | p value | ||
Maternal characteristics | ||||||||
Age | < 20 | 16,526 | 19.46 | 16,458 | 99.59 | 45 | 0.27 | < 0.001 |
20–35 | 58,998 | 69.47 | 58,515 | 99.18 | 408 | 0.69 | ||
> 35 | 8551 | 10.07 | 8427 | 98.55 | 106 | 1.24 | ||
Parity c | < 1birth | 29,502 | 34.74 | 29,418 | 99.72 | 55 | 0.16 | < 0.001 |
2 births | 16,264 | 19.15 | 16,178 | 99.47 | 72 | 0.44 | ||
3 or 4 births | 20,133 | 23.71 | 19,966 | 99.17 | 147 | 0.73 | ||
> 5 births | 18,977 | 22.35 | 18,647 | 98.26 | 294 | 1.55 | ||
Obstetric factors | ||||||||
Mode of delivery | Vaginal | 64,993 | 76.53 | 64,942 | 99.92 | 42 | 0.06 | < 0.001 |
Cesarean | 16,218 | 19.1 | 15,736 | 97.03 | 477 | 2.94 | ||
Instrumental | 1775 | 2.09 | 1767 | 99.55 | 8 | 0.45 | ||
Breech | 1544 | 1.82 | 1539 | 99.68 | 4 | 0.26 | ||
Other | 91 | 0.11 | 59 | 64.84 | 32 | 35.16 | ||
Delivery induced | Yes | 2484 | 2.92 | 2464 | 99.19 | 19 | 0.77 | 0.545 |
No | 82,162 | 96.75 | 81,598 | 99.31 | 546 | 0.66 | ||
No. prenatal visits | None | 8756 | 10.31 | 8592 | 98.13 | 135 | 1.55 | < 0.001 |
1 to 4 | 65,024 | 76.57 | 64,600 | 99.35 | 381 | 0.59 | ||
> 4 | 10,470 | 12.33 | 10,421 | 99.53 | 44 | 0.42 | ||
Prior cesarean | Yes | 5894 | 6.94 | 5771 | 97.91 | 121 | 2.05 | < 0.001 |
No | 78,926 | 92.94 | 78,395 | 99.33 | 447 | 0.57 | ||
Comorbidity | Yes | 20,384 | 24.00 | 20,141 | 98.81 | 184 | 0.90 | < 0.001 |
No | 64,502 | 75.95 | 64,086 | 99.36 | 385 | 0.60 | ||
Obstructed labor | Yes | 13,822 | 16.28 | 13,382 | 96.82 | 438 | 3.17 | < 0.001 |
No | 70,978 | 83.58 | 70,841 | 99.81 | 130 | 0.18 | ||
Pre/eclampsia | Yes | 2967 | 3.52 | 2967 | 99.20 | 19 | 0.64 | 0.812 |
No | 81,228 | 96.31 | 81,228 | 99.32 | 550 | 0.67 | ||
Hemorrhage | Yes | 5220 | 6.15 | 4827 | 92.47 | 382 | 7.32 | < 0.001 |
No | 79,594 | 93.72 | 79,398 | 99.75 | 186 | 0.23 | ||
> 90% centile of | Yes | 9919 | 11.68 | 9777 | 98.57 | 140 | 1.41 | < 0.001 |
birth weights | No | 74,529 | 87.76 | 74,097 | 99.42 | 420 | 0.56 |