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Table 1 PedsQL™ 4.0 Generic Core Scales Total Scale Score: Child Self-Report Reliability and Validity

From: How young can children reliably and validly self-report their health-related quality of life?: An analysis of 8,591 children across age subgroups with the PedsQL™ 4.0 Generic Core Scales

Age Reliability Validity
    Chronic Health Condition Healthy Sample   
  n α Mean SD % Floor % Ceiling Mean SD % Floor % Ceiling Chronic vs. Healthy Difference Chronic vs. Healthy Effect Size
5 yrs 693 0.86 74.83 15.41 0.0 2.6 83.22 12.18 0.0 8.2 8.39* 0.69
6 yrs 913 0.86 76.24 14.82 0.0 4.3 82.12 12.73 0.0 7.1 5.88* 0.46
7 yrs 869 0.87 71.21 15.42 0.0 0.0 80.98 12.98 0.0 7.4 9.77* 0.75
8 yrs 864 0.90 75.43 14.73 0.0 1.6 83.54 12.95 0.0 8.6 8.11* 0.63
9 yrs 827 0.91 74.16 15.75 0.0 1.7 83.71 13.76 0.0 7.2 9.55* 0.69
10 yrs 825 0.90 76.13 15.84 0.0 3.1 84.16 12.72 0.0 9.5 8.03* 0.63
11 yrs 675 0.91 76.63 15.56 0.0 2.0 85.61 12.47 0.0 9.7 8.98* 0.72
12 yrs 669 0.91 76.57 15.48 0.0 1.3 84.01 12.97 0.0 9.9 7.44* 0.57
13 yrs 609 0.92 75.08 16.06 0.0 3.1 84.23 13.15 0.0 9.8 9.15* 0.70
14 yrs 560 0.92 74.10 16.34 0.0 2.9 85.71 11.97 0.0 11.6 11.61* 0.97
15 yrs 554 0.91 75.03 14.97 0.0 0.9 84.70 12.73 0.0 12.8 9.68* 0.76
16 yrs 327 0.91 74.67 16.52 0.0 0.6 85.76 11.41 0.0 10.1 11.09* 0.97
  1. Note: Total N = 8,385 for reliability, Total N = 8,098 for validity.
  2. Higher values equal better health-related quality of life.
  3. % Floor/Ceiling = the percentage of scores at the extremes of the scaling range.
  4. Effect sizes are designated as small (.20), medium (.50), and large (.80).
  5. *p < .001 (independent samples t-test).