Fig. 1

OPN levels in the lean/overweight non-PCOS and PCOS groups and in FAI quartile groups. (a) OPN levels in the non-PCOS group and PCOS group. (b) OPN levels in lean and overweight non-PCOS groups and lean and overweight PCOS groups. (c) OPN levels by FAI in the PCOS group.

For comparison between two groups, the Mann-Whitney U test was performed. The Kruskal-Wallis test followed by the Mann-Whitney U test was performed to test the differences among the four subgroups. Data are displayed as median with interquartile range. *P < 0.05, **P < 0.01. FAI: free androgen index.