The likelihood of a healthy live birth after frozen embryo transfer with endometrium prepared by natural ovulation regimen vs programmed regimen: a propensity-score matching study.

Compared with the programmed regimen, the natural ovulation regimen was associated with 22.2% lower probability of clinical pregnancy loss among women aged <35 years (relative risk [RR], 0.778; 95% confidence interval [CI], 0.647–0.936), whereas the between-group difference did not reach statistical significance among women aged ≥35 years (RR, 0.838; 95% CI, 0.667−1.051).

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