Study characteristics
The characteristics of the included studies are given in Table 1. The age of patients was between 18 and 45 years old, and the sizes of ovarian cysts in the selected studies were similar, mainly at a diameter of 3-10 cm. Five of the selected studies included patients with various kinds of ovarian cysts2, 4, 19, 22, 23, while the others included patients with only endometriomas3, 16-18, 20, 21, 24, 25. As for intervention, we defined nonthermal hemostatic method as the experimental group. Six studies used suturing as the nonthermal hemostatic method4, 16-19, 22, another six used hemostatic matrix or sealants2, 3, 20, 21, 23, 24, and one study combined suturing with hemostatic matrix25. The control group received electrocoagulation using bipolar current. The bipolar current used in all included studies had a power range of 20 to 40 watts. The basal serum AMH level before surgery did not differ significantly between the two groups.