Fig. 1

Correlation analysis between melatonin in follicular fluid and basic hormones in serum. A significant positive correlation between the melatonin in follicular fluid and serum FSH (r = 0.308; p = 0.013). No significant correlation was found between the melatonin concentration and LH (rs = − 0.045; p = 0.727), Estradiol (rs = 0.166; p = 0.191), progesterone (r = − 0.005; p = 0.977), testosterone (r = − 0.150; p = 0.336) and anti Mullerian hormone (rs = − 0.189; p = 0.119). *r represents Pearson correlation coefficients; rs represents Spearman rank correlation coefficients