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Table 6 PedsQL™ 4.0 Generic Core Scales School Functioning Scale Score: Parent Proxy-Report Reliability and Validity

From: Parent proxy-report of their children's health-related quality of life: an analysis of 13,878 parents' reliability and validity across age subgroups using 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
2 yrs 438 0.59 82.08 19.52 0.0 13.7 89.89 14.95 0.0 19.5 7.81* 0.52
3 yrs 592 0.69 70.71 24.41 0.8 10.7 88.31 16.05 0.1 23.4 17.60* 1.10
4 yrs 798 0.61 72.72 24.94 1.4 13.8 86.18 16.60 0.0 30.1 13.46* 0.81
5 yrs 908 0.74 69.04 22.62 1.2 10.5 78.47 18.93 0.0 17.6 9.43* 0.50
6 yrs 1,117 0.72 70.75 19.44 0.0 7.4 77.36 19.45 0.0 17.6 6.61* 0.34
7 yrs 1,068 0.74 66.23 22.64 1.1 7.2 75.65 19.95 0.1 17.1 9.42* 0.47
8 yrs 1,019 0.74 68.31 21.16 0.9 7.4 76.59 19.22 0.1 18.4 8.28* 0.43
9 yrs 962 0.73 65.31 21.68 0.4 5.8 74.98 20.02 0.0 16.9 9.67* 0.48
10 yrs 970 0.77 66.10 22.96 0.6 9.1 75.42 20.03 0.2 17.7 9.32* 0.47
11 yrs 774 0.77 67.02 23.06 0.4 6.0 76.65 20.16 0.2 20.6 9.63* 0.48
12 yrs 761 0.78 65.17 21.95 0.7 7.4 76.98 19.48 0.0 18.7 11.81* 0.61
13 yrs 699 0.76 67.22 21.91 0.0 9.6 75.31 21.13 0.0 20.6 8.09* 0.38
14 yrs 638 0.78 65.93 21.34 0.0 7.5 77.54 19.82 0.0 23.8 11.61* 0.59
15 yrs 613 0.79 64.53 21.69 0.8 6.4 76.25 20.42 0.0 22.8 11.72* 0.57
16 yrs 355 0.79 65.70 23.17 0.5 9.1 77.26 18.83 0.0 20.6 11.56* 0.61
  1. Note: Total N = 11,712 for reliability, Total N = 11,106 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).