This is a monocentric retrospective observational study. The study focuses on the women who underwent Assisted Reproductive Technology (ART) cycles with poor ovarian response (POR), defined as \<4 oocytes retrieved. The objectives of the study are as follows: * Evaluate clinical pregnancy rate (CPR) and cumulative live birth rate (CLBR) in women with poor ovarian response. * Evaluate abortion rate in women with poor ovarian response. * Evaluate the influence of patient characteristics (age, Anti-Müllerian hormone \[AMH\] levels, Antral Follicle Count \[AFC\], Follicle Stimulating Hormone \[FSH\], Body Mass Index \[BMI\]) on women with poor ovarian response. 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 2010 to December 2023 will be included in the evaluation. Outcomes will be expressed in terms of CLBR, CPR and Abortion Rate.
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Clinical Pregnancy Rate (CPR)
Timeframe: January 2010 - December 2023
Cumulative Live Birth Rate (CLBR)
Timeframe: January 2010 - December 2023
Abortion Rate
Timeframe: January 2010 - December 2023