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To investigate the effect of endometrial thickness on the clinical outcome of cleavage embryo HRT-FET on the day of embryo transfer and analyzed the threshold and optimal thickness interval corresponding to ideal clinical pregnancy rate by statistical method. A total of 5861 HRT-FET cycles with cleavage embryo transferred from January 2013 to December 2017 in the Reproductive Medicine Center of Henan Provincial People's Hospital were studied retrospectively.Fifth-order grouping of endometrial thickness (EMT) on embryo transfer day as a c