RARRES2 and diabetes mellitus: Logistic regression analysis revealed that plasma chemerin concentration (OR:1.943, 95%CI:1.017-3.711, p<0.05), duration of diabetes (OR:1.626, 95% CI:1.28-2.06, p<0.01), total cholesterol (OR:2.002, 95% CI:1.069-3.757, p<0.05), and HbA1c (OR:1.342, 95% CI:1.211-1.606, p<0.01) were independent risk factors of retinopathy.