CRP and diabetes mellitus: After conducted, the odds ratios (ORs) of DR showed that age (OR 1.036, 95% CI: 1.004 ~ 1.069, p = 0.029), diabetes duration (OR 1.106, 95% CI: 1.061 ~ 1.153, p = 0.001), FPG (OR 1.126, 95% CI: 1.003 ~ 1.264, p = 0.045), HbA1c (OR 1.197, 95% CI: 1.051 ~ 1.363, p = 0.007) and the CRP/HDL-C ratio (OR 3.176, 95% CI: 1.280 ~ 7.877, p = 0.013) were identified as risk factors for DR (Table 3).