Serum 25(OH)D levels are associated with normal fertilization rates in women but not in men among couples undergoing IVF.docx

Table S1 and S2 showed baseline characteristics and normal fertilization rate according to quartiles of 25(OH)D level in 1,234 couples undergoing IVF. The baseline characteristics were all matched. The normal fertilization rates in women were 59.69%, 61.50%, 63.97% and 65.00% respectively (<i>P</i>=0.005). There were significant differences between Q1 and Q3, Q1 and Q4, Q2 and Q4 (<i>P</i>=0.013, 0.000, 0.007, respectively). However, in men, there were no significant differences among the groups (<i>P</i>=0.300)