Figure 2.
Total renal volume expressed by quartile of serum vascular endothelial growth factor (VEGF) level.
Renal volume was adjusted for age, sex, and body surface area. VEGF range < 50th percentile < 440 pg/ml; 50–75th percentile 224–2750 pg/ml; > 75th percentile 2950–18,000 pg/ml. All P-values were corrected for multiple comparisons by the Tukey-Kramer correction (21).