Fig. 3From: Effect of vitamin D status on normal fertilization rate following in vitro fertilizationThe relationship of follicular fluid vitamin D levels and serum vitamin D levels. Follicular fluid vitamin D levels were positively correlated with serum vitamin D levels (r = 0.85, p < 0.001). The levels of follicular fluid vitamin D were significantly higher than the levels of serum vitamin D (P < 0.001)Back to article page