FMR1 and Infertility: The proportion of 35–44 CGG repeat at both FMR1 alleles showed a higher trend in the secondary infertility group as compared to the control group after adjusting for age, education, smoking status, cohort and the CGG repeats of the other FMR1 allele (aOR=7.812, 95% CI 0.884-69.001; p=0.064 for allele 1; aOR=3.657, 95% CI 2.193-6.098; p<0.001 for allele 2, respectively).