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Serum uric acid (SUA) concentrations in no apparent diabetic retinopathy (NDR), non-proliferative DR (NPDR), and proliferative DR (PDR) groups. NDR group, n = 292, SUA = 5.7 ± 1.7 mg/dL; NPDR group, n = 73, SUA = 6.22 ± 1.8 mg/dL, PDR group, n = 20, SUA = 7.4 ± 2.5 mg/dL. * p < 0.001, PDR group versus NPDR group. # p < 0.001, PDR group versus NDR group.
