In the logistic regression analysis, we included the factors with p < 0.1 in the multivariate analysis, and the results revealed that hypertension, IL-8, UA and C3 were independent risk factors for SWO (OR = 4.785, 95% CI: 1.850–12.377, p = 0.001, OR = 2.360, 95% CI: 1.232–4.521, p = 0.010, OR = 2.474, 95% CI: 1.376–4.448, p = 0.002, and OR = 4.031, 95% CI: 2.010–8.081, p = 0.000, respectively, Table 2). This evidence concerns the gene CXCL8 and Hypertension.