PLOD1 and Infertility: Splitting the sample into two groups below and above 35 years old (n=238 and n=256, respectively), it is observed that there are more women with primary infertility causes in the group below 35 years old (86.6% vs. 71.0%; p<0.001), the duration of this infertility is shorter (48.05 months vs. 54.04 months; p=0.041), and the LH:FSH ratio is lower in women above 35 years old (0.90 vs. 1.15; p<0.001) (Table 8).