However, among patients with different BMI (OR 0.94 vs 0.97, P for interaction = 0.247), different AFCs (OR 0.93 vs 1.00, P for interaction = 0.390), different endometrium thickness on hCG trigger day (OR 0.97 vs 0.88, P for interaction = 0.597), primary or secondary infertility (OR 0.96 vs 0.96, P for interaction = 0.322), different protocols (OR 0.86, 0.92 and 0.97, P for interaction = 0.094),and different method of fertilization (OR 0.93 vs 0.97, P for interaction = 0.200), the stratification factors failed to have an interaction effect with FSH total dose in LBR. Here, BRD2 is linked to Infertility.