| 组别 | n | 子痫前期 | 前置胎盘 | 剖宫产 | 胎膜早破 | 总发生率 |
| 病例组 | 34 | 2 (5.88%) | 1 (2.94%) | 3 (8.82%) | 1 (2.94%) | 20.59% (7/34) |
| 参照组 | 51 | 1 (1.96%) | 0 (0.00) | 1 (1.96%) | 0 (0.00%) | 3.92% (2/51) |
| X2 |
|
|
|
|
| 5.986 |
| P |
|
|
|
|
| <0.05 |