Impact of the Operator Performing Oocyte Retrieval on the Cumulative Live Birth Rate

This is a monocentric retrospective observational study. The study investigates the impact of the operator performing the oocyte retrieval on the cumulative live birth rate (CLBR). The objectives of the study are as follows: * To evaluate whether the operator performing the oocyte retrieval influences the probability of pregnancy, expressed as the cumulative live birth rate (CLBR). * To assess whether operator performance improves with increased experience. To address the study objectives, data will be collected using a specific internal web-based database. All oocyte retrieval procedures performed at the Humanitas Fertility Center from January 2013 to December 2022 will be included in the evaluation. Outcomes will be expressed in terms of CLBR.