Figure 1. Pigment epithelium-derived factor (PEDF), blood urea nitrogen (BUN), and creatinine levels in 243 type 2 diabetic patients. A: PEDF levels and the stage of diabetic retinopathy. B: BUN levels and the stage of diabetic retinopathy. C: Creatinine levels and the stage of diabetic retinopathy. Abbreviations: NDR represents no apparent diabetic retinopathy, M-NPDR represents mild to moderate nonproliferative diabetic retinopathy, S-NPDR represents severe nonproliferative diabetic retinopathy, PDR represents proliferative diabetic retinopathy, and the asterisk represents a p<0.05.