Randomization
ovarian endometrioma
All patients were diagnosed with ovarian endometrioma by ultrasound and were administered OC for one cycle before laparoscopy to inhibit ovulation and identify the menstruation phase. After written consent, the randomized number was concealed in an opaque, sealed envelope for each patient, and the envelopes were opened sequentially by a study nurse before surgery. Randomization was performed in a 1:1 ratio, according to a computer-generated number list, into two groups. The single number drawn was included in the group LLP, and the double number was included in the group EFP. All patients were randomly divided into two groups: laparoscopy at late luteal phase (group LLP) (n = 44): termination of OC for two days; and laparoscopy at Early follicular phase (group EFP) (n = 44): day 3 after menstruation.