| 项目 | n (%) | 输血次数 | c2/fisher值 | P值 | |
| 1次(%) | ≥2次(%) | ||||
| 阴道炎 | 7 (5.9) | 7 (100.0) | 0 (0.0) |
| >0.05 |
| 阴道出血 | 7 (5.9) | 5 (71.4) | 2 (28.6) |
| >0.05 |
| 孕期感冒 | 18 (15.1) | 14 (77.8) | 4 (22.2) | 0.648 | >0.05 |
| 妊高症 | 38 (31.9) | 21 (55.3) | 17 (44.7) | 5.551 | 0.021 |
| 妊娠期糖尿病 | 8 (6.7) | 5 (62.5) | 3 (37.5) |
| >0.05 |
| 甲状腺功能减退 | 4 (3.4) | 4 (100.0) | 0 (0.0) |
| >0.05 |
| 孕期贫血 | 17 (14.3) | 13 (76.5) | 4 (23.5) | 0.425 | >0.05 |
| 流产史 | 60 (50.4) | 44 (73.3) | 16 (26.7) | 0.737 | >0.05 |
| 高危血型 | 35 (31.0) | 25 (71.4) | 10 (28.6) | 0.137 | >0.05 |
| 产前类固醇 | 23 (20.4) | 16 (69.6) | 7 (30.4) | 0.004 | >0.05 |
| 母亲年龄>=31岁 | 64 (55.2) | 46 (71.9) | 18 (28.1) | 0.565 | >0.05 |