Table 2. Baseline characteristics of In vitro Fertilization– Embryo transfer (IVF-ET) patients in control and heterotopic pregnancies.
| Variables | IVF-ET patients | P value | |
|---|---|---|---|
| Control n = 84 |
Heterotopic pregnancy n = 40 |
||
| Age, yr | 32.9 ± 2.9 | 32.8 ± 2.9 | 0.881* |
| Body mass index, kg/m2 | 20.8 ± 2.3 | 20.6 ± 2.4 | 0.542* |
| Primary infertility | 50 (59.5%) | 14 (35.0%) | 0.011† |
| Duration of infertility, mon | 43.1 ± 23.6 | 31.6 ± 26.3 | 0.054* |
| Prior IVF cycles | 1.9 ± 1.0 | 1.9 ± 1.3 | 0.896* |
| Abortion | < 0.001‡ | ||
| 0 | 58 (69.0%) | 16 (40.0%) | |
| 1 | 20 (23.8%) | 11 (27.5%) | |
| 2 | 3 (3.6%) | 5 (12.5%) | |
| ≥ 3 | 3 (3.6%) | 8 (20.0%) | |
| Previous ectopic pregnancy history | 0.002‡ | ||
| 0 | 81 (96.4%) | 31 (77.5%) | |
| 1 | 2 (2.4%) | 6 (15.0%) | |
| 2 | 1 (1.2%) | 3 (7.5%) | |
| Previous tubal surgery | 12 (14.3%) | 13 (32.5%) | 0.018† |
| Previous PID history | 3 (3.6%) | 4 (10.5%) | 0.202§ |
| Hysterosalpingography | 0.428† | ||
| Normal finding | 49 (58.3%) | 18 (45.0%) | |
| Tubal obstruction | 20 (23.8%) | 14 (35.0%) | |
| Uterine anomaly | 1 (1.2%) | 0 (0.0%) | |
| Unknown | 14 (16.7%) | 8 (20%) | |
| Indication for IVF | 0.001† | ||
| Male factor | 20 (23.8%) | 3 (7.5%) | |
| Tubal factor | 11 (13.1%) | 14 (35%) | |
| Endometriosis | 13 (15.5%) | 5 (12.5%) | |
| Nontubal female factor | 12 (14.3%) | 6 (15.0%) | |
| Unexplained | 28 (33.3%) | 8 (20.0%) | |
| Unknown | 0 (0.0%) | 4 (10.0%) | |
Values are expressed as mean ± standard deviation or n (%).
PID, pelvic inflammatory disease; FSH, follicle-stimulating hormone.
*t-test; †χ2 test; ‡Linear by linear association; §Fisher’s exact test.