Figure 2. Relationship between pigment epithelium-derived factor and renal function. A: Correlation between pigment epithelium-derived factor (PEDF) levels and blood urea nitrogen shows a correlation coefficient of r=0.54 at a significance level of p<0.0001. B: Correlation between PEDF levels and creatinine shows a correlation coefficient of r=0.57 at a significance level of p<0.0001.