Fig. 1 .

The curve of receiver operating characteristic test for defining cut point for 12-PSS in comparison with VAS (mild, moderate, severe, and very severe). The area under the curve for figure A (defining cut point mild), B (defining cut point moderate), and C (defining cut point severe), with 95% confidence interval were 0.98 ± 0.01, 0.95 ± 0.02, and 0.97 ± 0.02, respectively with p-value < 0.001. Abbreviations: Visual analog scale (VAS), 12-item pruritus severity score (12-PSS).