PLOD1 and endometriosis: Compared with the control group, females with a history of endometriosis had higher baseline serum E2 levels (Table 1, 38.6 versus 32.2 pg/mL, P = 0.004), lower LH levels (Table 1, 4.2 versus 4.7 IU/L, P = 0.001), lower body mass indexes (BMI, Table 1, 20.6 versus 21.6 kg/m2, P = 0.022), and a higher frequency of suffering RIF (Table 1, 35.9% versus 16.5%, P = 0.002).