Table 3 Basic parameters and ectopic pregnancy rate in frozen-thawed embryo transfer cycles with different body mass index (kg/m2)
< 18.5 | 18.5–23.9 | ≥ 24 | P value | |
|---|---|---|---|---|
No. | 883 | 8840 | 5039 | |
Age (year) | 29.03 ± 4.11 | 30.50 ± 4.46 | 31.03 ± 4.84 | < 0.001 |
BMI (kg/m2) | 17.68 ± 0.67 | 21.40 ± 1.47 | 26.69 ± 2.22 | < 0.001 |
Infertility type | ||||
Primary | 496 (56.17%) | 4122 (46.63%) | 2161 (42.89%) | < 0.001 |
Secondary | 387 (43.83%) | 4718 (53.37%) | 2878 (57.11%) | |
Tubal factor existed | ||||
Yes | 383 (43.37%) | 3587 (40.58%) | 1932 (38.34%) | < 0.001 |
No | 500 (56.63%) | 5253 (59.42%) | 3107 (61.66%) | |
Endometrial preparation Protocol | ||||
Natural cycle | 350 (39.64%) | 3415 (38.63%) | 1439 (28.56%) | < 0.001 |
Artificial cycle | 533 (60.36%) | 5425 (61.37%) | 3600 (71.44%) | |
Endometrial thickness (mm) | 10.50 ± 1.95 | 10.39 ± 1.99 | 10.30 ± 2.03 | 0.034 |
Type of embryos | ||||
Cleavage | 441 (49.94%) | 4043 (45.74%) | 2019 (40.07%) | < 0.001 |
Blastocyst | 442 (50.06%) | 4797 (54.26%) | 3020 (59.93%) | |
No. of embryos transferred | 1.72 ± 0.58 | 1.65 ± 0.60 | 1.59 ± 0.60 | < 0.001 |
1 | 310 (35.11%) | 3666 (41.47%) | 2367 (46.97%) | |
2 | 512 (57.98%) | 4558 (51.56%) | 2378 (47.19%) | < 0.001 |
3 | 61 (6.91%) | 616 (6.97%) | 294 (5.84%) | |
Ectopic pregnancy, n (%) | 24 (2.72%) | 244 (2.76%) | 149 (2.96%) | 0.782 |