Table 2.

Description of the HRQL Profile and Psychometric Assessment of the Scale

	SF-12	Disease Burden	Symptoms	Kidney Disease
Mean ± SD	48.9 ± 22.3	35.0 ± 27.5	67.4 ± 19.4	50.8 ± 25.2
Range	0–100	0–100	0–100	0–100
Minimum (%)	0.8	10.6	0.8	0.7
Maximum (%)	0.8	5.7	1.6	1.5
Cronbach’s alpha	0.7	0.8	0.7	0.8
Correlation range item-domain	0.5–0.8	0.7–0.8	0.5–0.7	0.5–0.8
% of success for internal consistency	100 (12/12)	100 (4/4)	100 (12/12)	100 (8/8)
Correlation range item-other domain	0.2–0.5	0.3–0.4	0.2–0.6	0.2–0.6
% success for discriminant validity	1000 (36/36)	100 (12/12)	100 (36/36)	100 (24/24)

Abbreviations: SD, standard deviation; IQR, interquartile range.