Table 2. Baseline characteristics (history of reproduction, gynecology, and surgery).
| EP | IUP | NonP | P-value | ||||
| na | (%) | na | (%) | na | (%) | ||
| Reproductive history | |||||||
| Number of previous abortions | 0.71 | ||||||
| 0 | 873 | (36.88) | 930 | (38.49) | 948 | (39.34) | |
| 1 | 763 | (32.23) | 756 | (31.29) | 749 | (31.08) | |
| 2 | 485 | (20.49) | 497 | (20.57) | 484 | (20.08) | |
| ≥3 | 246 | (10.39) | 233 | (9.64) | 229 | (9.50) | |
| Parity | <0.01 | ||||||
| 0 | 1,143 | (48.29) | 1,280 | (52.98) | 639 | (26.54) | |
| 1 | 994 | (41.99) | 973 | (40.27) | 1,465 | (60.84) | |
| ≥2 | 230 | (9.72) | 163 | (6.75) | 304 | (12.62) | |
| Gynecologic history | |||||||
| Previous ectopic pregnancy | <0.01 | ||||||
| No | 2,093 | (86.81) | 2,363 | (97.81) | 2,356 | (97.40) | |
| Yes | 318 | (13.19) | 53 | (2.19) | 63 | (2.60) | |
| Serum Chlamydia trachomatis IgG test | <0.01 | ||||||
| Negative | 1,648 | (69.13) | 2,099 | (89.55) | 2,181 | (90.91) | |
| Positive | 736 | (30.87) | 245 | (10.45) | 218 | (9.09) | |
| Previous infertility | <0.01 | ||||||
| No | 2,005 | (83.26) | 2,286 | (95.65) | 2,325 | (96.47) | |
| Yes | 403 | (16.74) | 104 | (4.35) | 76 | (3.15) | |
| Previous cesarean section a | 0.79 | ||||||
| No | 691 | (56.09) | 624 | (54.74) | 988 | (55.72) | |
| Yes | 541 | (43.91) | 516 | (45.26) | 785 | (44.28) | |
| Surgical history | |||||||
| Previous adnexal surgery | <0.01 | ||||||
| No | 1,985 | (82.33) | 2,322 | (96.19) | 2,242 | (92.84) | |
| Yes | 426 | (17.67) | 92 | (3.81) | 173 | (7.16) | |
| Previous appendectomy | 0.01 | ||||||
| No | 2,303 | (95.84) | 2,346 | (97.47) | 2,331 | (96.44) | |
| Yes | 100 | (4.16) | 61 | (2.53) | 86 | (3.56) | |
EP, ectopic pregnancy; IUP, intrauterine pregnancy; NonP, nonpregnancy; LNG-EC, levonorgestrel emergency contraception.
a
The number of women who had delivered a child was used as the denominator to calculate the percentage.