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This study aimed to develop a regression equation model to optimize the timing of ovulation trigger in COS..<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We retrospectively analyzed 503 COS cycles (380 with follitropin alfa, 123 with follitropin delta) as training data. We modified the Follicle-To-Oocyte Index (FOI) and developed the Follicle-To-mature Oocyte Index (FmOI), which indicates how many mature oocytes (MII) were obtained for each antral follicle count. This index was used as an indicator for the retrieval of mature oocytes. When using FmOI as the objective variable, we selected relevant factors through Lasso regression analysis. Based on the obtained regression equations, the accuracy was compared and verified by predicting the number of MII in the test data.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Lasso regression analysis resulted in the creation of an FmOI prediction model using Initial serum FSH, number of follicles\u2009\u2265\u200914\u00a0mm, and total gonadotropin dose as explanatory variables. The regression equation model achieved Median Absolute Error values of 1.90 and 1.80 MII counts in the test data for the Alfa and Delta groups, respectively. Concordance index for MII prediction were 0.98 for follitropin alfa and 0.87 for follitropin delta. Use of the model showed higher CLBR in Alfa and non-inferiority in Delta than control group.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This model reliably predicts the number of MII and optimizes trigger timing in COS. By considering key predictors, it provides a precise tool to enhance clinical outcomes in assistedreproductive technology .<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12958-025-01489-7","type":"journal-article","created":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T01:58:58Z","timestamp":1762135138000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Predicting the optimal timing for triggering in controlled ovarian stimulation: mature oocytes retrieval predictor"],"prefix":"10.1186","volume":"23","author":[{"given":"Masato","family":"Kobanawa","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,11,3]]},"reference":[{"key":"1489_CR1","doi-asserted-by":"publisher","first-page":"517","DOI":"10.1016\/S0889-8545(05)70152-2","volume":"27","author":"KL Thornton","year":"2000","unstructured":"Thornton KL. 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