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Table 6 PedsQL™ 4.0 Generic Core Scales School Functioning 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 702 0.63 72.24 20.78 0.0 13.5 82.02 15.92 0.0 22.5 9.77* 0.61
6 yrs 920 0.59 71.81 18.11 0.0 10.5 79.93 16.56 0.1 21.6 8.12* 0.49
7 yrs 873 0.62 68.15 18.15 0.0 5.4 77.90 17.16 0.0 18.4 9.76* 0.57
8 yrs 872 0.68 73.27 17.39 0.0 6.7 82.11 15.56 0.0 21.0 8.84* 0.57
9 yrs 831 0.74 69.75 19.59 0.0 5.1 81.05 17.15 0.4 18.1 11.30* 0.66
10 yrs 832 0.72 72.76 19.45 0.4 8.9 80.95 16.32 0.0 19.4 8.19* 0.50
11 yrs 676 0.76 72.37 19.37 0.4 7.7 83.43 15.56 0.0 23.8 11.05* 0.71
12 yrs 677 0.75 71.94 19.30 0.4 8.4 80.25 17.26 0.0 20.5 8.30* 0.48
13 yrs 612 0.79 69.56 21.34 0.0 8.9 80.17 17.13 0.0 19.3 10.61* 0.62
14 yrs 563 0.76 69.94 18.14 0.0 8.4 81.17 17.07 0.3 21.9 11.23* 0.66
15 yrs 556 0.78 67.78 19.02 0.0 5.2 79.33 17.85 0.0 20.8 11.55* 0.65
16 yrs 328 0.77 68.36 19.93 0.6 5.6 81.49 17.41 0.0 23.0 13.12* 0.75
  1. Note: Total N = 8,442 for reliability, Total N = 8,211 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).