PLOD1 and spontaneous abortion: No significant differences were observed in female average age (33.98 ± 4.30 vs. 33.40 ± 4.22, P = 0.091), male average age (35.57 ± 4.93 vs. 35.50 ± 5.47, P = 0.882), BMI (22.39 ± 2.95 vs. 22.58 ± 3.93, P = 0.527), number of miscarriages (2.65 ± 0.73 vs. 2.50 ± 1.21, P = 0.116), endometrium thickness (9.15 ± 1.80 vs. 9.25 ± 1.95, P = 0.442) and hormone levels (FSH, LH, E2, P, AMH).