Table 2. Risk of uterine rupture by gestational age group of index cesarean delivery.
| Periviable | Term | Unadjusted | ||
|---|---|---|---|---|
|
| ||||
| (20-26 weeks) | (37-41 weeks) | OR (95% CI) | p-value | |
| All patients | 8/456 (1.8%) | 38/10,505 (0.4%) | 4.9 (2.3 – 10.6) | <0.001 |
| By incision type | ||||
| Classical | 4/163 (2.5%) | 0/61 (0%) | –1 | – |
| Low transverse | 4/228 (1.8%) | 36/9,558 (0.4%) | 4.7 (1.7 – 13.4) | 0.004 |
| Other2 | 0/1 (0%) | 0/11 (0%) | –1 | – |
| Missing | 0/64 (0%) | 2/875 (<0.1%) | –1 | – |
| By induction or augmentation | ||||
| No | 8/420 (1.9%) | 23/8,824 (0.3%) | 7.4 (3.3 – 16.7) | <0.001 |
| Yes | 0/36 (0%) | 15/1,681 (0.9%) | –1 | – |
1
OR could not be estimated for classical, other, and missing incision types or for womenwith induction/augmentation, due to lack of events.
2
other incision types as determined by ICD-9-CM procedure code 74.4 or 74.9