Variable | Prepregnancy BMI category (kg/m2) | P value a | |||
---|---|---|---|---|---|
A(M&P < 25) | B(M < 25&P ≥ 25) | C(M ≥ 25&P < 25) | D(M&P ≥ 25) | ||
No. of cycles | 3276 | 1571 | 533 | 361 | Â |
Female age(y) | 30.89 ± 4.50 | 31.51 ± 4.46 | 31.39 ± 4.68 | 32.55 ± 4.74 | <0.001 |
Male age(y) | 32.83 ± 5.32 | 33.49 ± 5.41 | 33.70 ± 5.52 | 34.96 ± 6.02 | <0.001 |
Female BMI(kg/m2) | 21.23 ± 2.01 | 21.44 ± 1.99 | 26.89 ± 1.59 | 26.99 ± 1.75 | <0.001 |
Male BMI(kg/m2) | 22.09 ± 1.94 | 27.27 ± 1.96 | 22.26 ± 1.93 | 27.42 ± 2.08 | <0.001 |
Type of infertility | 0.006 | ||||
 Primary | 1633(49.8) | 755(48.1) | 228(42.8) | 159(44.0) |  |
 Secondary | 1643(50.2) | 816(51.9) | 305(57.2) | 202(56.0) |  |
Duration of infertility(y) | 3.72 ± 2.78 | 4.07 ± 3.13 | 4.27 ± 3.11 | 4.34 ± 3.39 | <0.001 |
Cause of infertility | |||||
 Ovulatory dysfunction | 209(6.4) | 104(6.6) | 84(15.8) | 60(16.6) | <0.001 |
 Diminished ovarian reserve | 248(7.6) | 122(7.8) | 28(5.3) | 27(7.5) | 0.258 |
 Endometriosis | 453(13.8) | 186(11.8) | 44(8.3) | 27(7.5) | <0.001 |
 Tubal factor | 2057(62.8) | 1015(64.6) | 360(67.5) | 230(63.7) | 0.163 |
 Uterine factor | 257(7.8) | 113(7.2) | 47(8.8) | 38(10.5) | 0.164 |
 Male factor | 1052(32.1) | 513(32.7) | 154(28.9) | 121(33.5) | 0.382 |
 Unexplained | 230(7.0) | 98(6.2) | 26(4.9) | 23(6.4) | 0.275 |
ART method | 0.045 | ||||
 IVF | 2346(71.6) | 1152(73.3) | 412(77.3) | 265(73.4) |  |
 ICSI | 930(28.4) | 419(26.7) | 121(22.7) | 96(26.6) |  |