Women may not benefit from repeated frozen embryo transfers: a retrospective analysis of the cumulative live birth rate of 43 972 women.

After adjusting for confounding factors, a decreasing trend in the aHR was observed among the five age groups ( Fig. 2A3 and A4 ).

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Moreover, there was an increasing trend in the number of retrieved oocytes (Groups 1–5: optimistic method: 82.5%, 91.7%, 93.6%, 94.1%, and 96.2%; conservative method: 58.6%, 76.7%, 84.8%, 88.0%, and 92.5%, respectively).

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