Skip to main content

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

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

  Mean SD Range of mean item score Range of SD item score Range of
ritem-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 0.68ns (0.66*/0.68ns)
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)
  1. Corrected item total correlation and Cronbach alpha coefficient: Range within scales
  2. 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)
  3. a Corrected for overlap.
  4. * statistically significant smaller Cronbach alpha between self and parent proxy report (p < 0.01) in Feldt Test [30]