Measuring adolescents' HRQoL via self reports and parent proxy reports: an evaluation of the psychometric properties of both versions of the KINDL-R instrument

Table 2 Range of mean item score and standard deviation, Internal consistency of item responses.

	Mean	SD	Range of mean item score	Range of SD item score	Range of r_item-total ^a	Cronbach alpha (11–13 years/14–17 years)
Self Report
Total	72.58	10.35	3.03–4.63	0.65–1.25	0.28–0.50	0.82* (0.80/0.83)
Physical	70.61	16.50	3.41–4.30	0.87–1.05	0.30–0.44	0.59* (0.55/0.61)
Psychological	81.10	13.09	3.79–4.64	0.68–0.83	0.31–0.49	0.59* (0.52/0.62)
Self-Esteem	58.29	18.42	3.03–3.55	0.90–1.21	0.37–0.55	0.68 (0.68/0.69)
Family	81.93	15.71	4.08–4.44	0.80–0.96	0.41–0.59	0.72* (0.63*/0.76)
Friends	77.43	14.99	3.85–4.56	0.65–1.14	0.22–0.43	0.53* (0.53/0.53)
School	66.14	17.22	3.37–4.05	0.78–1.25	0.17–0.40	0.53* (0.51/0.53)
Parent Report
Total	74.23	10.30	3.44–4.55	0.65–1.04	0.27–0.63	0.86 (0.86/0.86)
Physical	74.11	17.35	3.60–4.28	0.88–1.01	0.34–0.59	0.70 (0.67/0.72)
Psychological	79.19	13.20	3.83–4.55	0.67–.85	0.38–0.53	0.66 (0.64/0.67)
Self-Esteem	67.29	15.19	3.44–3.92	0.76–1.00	0.41–0.54	0.68^ns (0.66*/0.68^ns)
Family	76.38	15.09	3.57–4.33	0.71–.95	0.47–0.63	0.74 (0.74/0.74*)
Friends	77.07	14.15	3.70–4.37	0.66–.91	0.24–0.59	0.64 (0.65/0.64)
School	71.41	15.85	3.56–4.17	0.77–1.05	0.34–0.45	0.62 (0.59/0.62)

Corrected item total correlation and Cronbach alpha coefficient: Range within scales
Standard Errors (SE) for the means = self report: 0.12 – 0.21 vs. parent report: 0.12 – 0.20 (95% confidence intervals = Mean +/- 1.96*SE)
^a Corrected for overlap.
* statistically significant smaller Cronbach alpha between self and parent proxy report (p < 0.01) in Feldt Test [30]

ISSN: 1477-7525