Table III.
Adjusted odds ratios for predictive variables and participants who had live birth (with covariates of study type and site region added into the model).
| Variables | Live birth |
|
|---|---|---|
| Odds ratio (95% CI) | P-value | |
| Age | 0.930 (0.901, 0.961) | <0.001 |
| History of smoking | ||
| Never smoked | 1 | |
| Current smoking | 0.843 (0.522, 1.362) | 0.484 |
| Quit smoking | 1.379 (1.029, 1.847) | 0.031 |
| Duration of infertility | ||
| <2 years | 1 | |
| 2–4 years | 0.564 (0.421, 0.756) | <0.001 |
| >4 years | 0.534 (0.367, 0.776) | 0.001 |
| Prior pregnancy loss | ||
| Yes | 1 | |
| No | 0.626 (0.463, 0.847) | 0.002 |
| Adherence to study | ||
| Yes | 1 | |
| No | 0.180 (0.120, 0.272) | <0.001 |
| Treatment | ||
| Clomiphene | 1 | |
| Letrozole | 1.098 (0.816, 1.479) | 0.536 |
| Gonadotropin | 1.624 (1.131, 2.330) | 0.009 |