Table 3 Comparison of pregnancy and delivery history between the ET and NC groups
History of pregnancy and delivery | ET group, n (%) | NC group, n (%) | χ2 | P | Adjusted OR | 95%CI | P |
|---|---|---|---|---|---|---|---|
Number of pregnancies (including any previous and current pregnancy) | 30.208 | < 0.001 | 0.082 | 0.057–0.118 | < 0.001 | ||
1 | 154 (48.0) | 299 (31.0) | |||||
> 1 | 167 (52.0) | 664 (69.0) | |||||
Number of miscarriages | 7.56 | 0.006 | 0.736 | 0.569–0.952 | 0.02 | ||
0 | 231 (72.0) | 575 (59.7) | |||||
≥ 1 | 108 (33.6) | 388 (40.3) | |||||
Spontaneous abortion | 5.448 | 0.02 | 1.353 | 0.944–1.939 | 0.099 | ||
Yes | 35 (10.9) | 66 (6.85) | |||||
No | 286 (89.1) | 897 (93.1) | |||||
Induced abortion | 16.723 | < 0.001 | 0.674 | 0.529–0.859 | < 0.001 | ||
Yes | 75 (23.4) | 344 (35.7) | |||||
No | 246 (76.6) | 619 (64.3) | |||||
Fetal death | – | 0.604 | |||||
Yes | 2 (0.6) | 3 (0.3) | |||||
No | 319 (99.4) | 960 (99.7) | |||||
Stillbirth | – | 1 | |||||
Yes | 0 (0.0) | 2 (0.2) | |||||
No | 321 (100.0) | 961 (99.8) | |||||
Ectopic pregnancy | 92.704 | < 0.001 | 3.131 | 1.921–5.103 | < 0.001 | ||
Yes | 44 (13.7) | 11 (1.1) | |||||
No | 277 (86.3) | 952 (98.9) |