Clinical characteristics of the study population
endometrial thickness
We recruited 340 patients in total and 307 patients finished this study, including 154 patients in the experimental group and 153 patients in the control group. A total of 33 patients were lost to follow-up, namely, 17 patients in the experiment group and 16 patients in the control group. The baseline characteristics of all patients are shown in Basic statistical characteristics of the two groups of patients.BMI, body mass index; EMT, endometrial thickness; FSH, follicle-stimulating hormone; LH, luteinizing hormone; E2, estradiol.