CRP and diabetic kidney disease: Multivariate logistic regression analysis using stepwise selection identified four independent risk factors for early DKD: age (OR = 1.03, 95% CI [1.01–1.06], P = 0.044), CRP (OR = 1.02, 95% CI [1.01–1.04], P = 0.005), RSFI (OR = 0.50, 95% CI [0.30–0.85], P = 0.010), and RSFd (OR = 0.79, 95% CI [0.74–0.85], P < 0.001) (Table 2).