Table 5.

Correlation between quantitative variables and pruritus score in terms of Spearman's rho.

Variable		Correlation coefficient (P value)
		Distribution score	Severity score	Frequency score	Sleep score	Total score
Age (year)		0.42 (0.02)	-0.12 (0.54)	0.01 (0.96)	0.02 (0.89)	0.17 (0.37)
Duration of dialysis (months)		0.21 (0.27)	-0.10 (0.61)	0.08 (0.69)	0.14 (0.47)	0.03 (0.87)
Age of onset of dialysis (year)		0.28 (0.13)	-0.13 (0.50)	0.05 (0.78)	0.04 (0.83)	0.09 (0.64)
Serum BUN (mg/dl)	Mean	0.08 (0.68)	0.13 (0.47)	0.22 (0.23)	0.06 (0.74)	0.03 (0.84)
	Min	-0.06 (0.76)	0.07 (0.70)	0.17 (0.36)	0.12 (0.50)	-0.05 (0.79)
	Max	0.13 (0.47)	0.13 (0.48)	0.19 (0.31)	0.01 (0.92)	0.04 (0.82)
Serum Cr (mg/dl)	Mean	0.12 (0.51)	-0.11 (0.57)	0.01 (0.95)	0.08 (0.65)	0.02 (0.91)
	Min	0.11 (0.57)	-0.15 (0.42)	-0.01 (0.95)	0.05 (0.77)	-0.01 (0.94)
	Max	0.10 (0.60)	-0.09 (0.61)	-0.05 (0.78)	0.09 (0.64)	0.02 (0.90)
Serum Ca (mg/dl)	Mean	0.15 (0.41)	0.18 (0.33)	-0.19 (0.31)	0.09 (0.62)	0.29 (0.12)
	Min	0.09 (0.63)	0.27 (0.15)	-0.14 (0.46)	0.06 (0.76)	0.34 (0.06)
	Max	0.24 (0.19)	0.03 (0.87)	-0.19 (0.30)	0.11 (0.57)	0.17 (0.36)
Serum P (mg/dl)	Mean	-0.05 (0.78)	-0.23 (0.22)	-0.25 (0.18)	-0.13 (0.51)	-0.23 (0.22)
	Min	0.23 (0.23)	-0.15 (0.44)	0.02 (0.90)	0.21 (0.26)	0.01 (0.94)
	Max	-0.01 (0.97)	-0.23 (0.21)	-0.15 (0.43)	-0.12 (0.52)	-0.24 (0.19)
Serum PTH (ng/ml)	Mean	0.33 (0.11)	-0.13 (0.54)	0.23 (0.28)	0.05 (0.80)	0.06 (0.79)
	Min	0.42 (0.04)	-0.12 (0.58)	0.20 (0.34)	0.06 (0.76)	0.12 (0.56)
	Max	0.14 (0.49)	-0.12 (0.57)	0.14 (0.50)	-0.07 (0.74)	-0.05 (0.80)
Serum Ca×P		0.04 (0.82)	-0.17 (0.36)	-0.22 (0.23)	-0.09 (0.64)	-0.11 (0.55)

BUN: blood urea nitrogen; Cr: creatinine; Ca: calcium; P: phosphorus; PTH: parathyroid hormone; Min: minimum; Max: maximum.