RARRES2 and polycystic ovary syndrome: Significantly higher of FF chemerin levels were observed in the PCOS group compared to the control group (WMD: 41.7 pg/ml, 95% CI: 17.89, 65.5, p = .001) with the significant heterogeneity (n = 6, I2 = 83.5%, p < .001; Figure 4).