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Table 5 PedsQL™ 4.0 Generic Core Scales Social 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 1,288 0.78 84.03 19.78 0.0 34.5 88.55 16.08 0.2 46.5 4.52** 0.28
3 yrs 1,240 0.74 81.08 19.89 0.0 28.3 88.89 14.13 0.1 42.3 7.81*** 0.55
4 yrs 1,182 0.78 79.76 20.61 0.5 27.2 87.75 16.65 0.2 44.7 7.99*** 0.48
5 yrs 974 0.77 74.28 21.33 0.0 19.8 81.03 20.23 0.3 32.2 6.75*** 0.33
6 yrs 1,120 0.76 74.87 21.68 0.0 19.8 80.58 20.42 0.1 28.8 5.71*** 0.28
7 yrs 1,083 0.78 72.73 22.49 0.0 16.0 78.99 21.30 0.1 29.7 6.26*** 0.29
8 yrs 1,026 0.77 77.05 20.72 0.0 23.3 80.70 20.93 0.3 34.3 3.65* 0.17
9 yrs 968 0.79 72.58 22.44 0.4 15.5 78.13 23.03 0.5 31.8 5.55** 0.24
10 yrs 979 0.80 73.14 23.69 0.3 19.7 81.41 20.68 0.0 33.5 8.27*** 0.40
11 yrs 779 0.78 76.19 21.27 0.7 19.9 82.98 20.07 0.2 37.3 6.79*** 0.34
12 yrs 768 0.80 72.09 22.68 0.0 19.9 83.03 19.63 0.0 36.9 10.94*** 0.56
13 yrs 699 0.82 77.14 23.19 0.3 25.4 81.39 20.95 0.3 38.9 4.25* 0.20
14 yrs 646 0.82 73.43 23.41 0.4 21.4 85.32 19.03 0.0 46.0 11.89*** 0.62
15 yrs 623 0.81 76.82 22.46 0.4 25.7 83.33 19.50 0.3 42.4 6.51*** 0.33
16 yrs 361 0.81 75.01 23.59 1.0 21.7 85.40 17.91 0.0 42.4 10.39*** 0.58
  1. Note: Total N = 13,736 for reliability, Total N = 12,991 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 < .05, **p < .01, ***p < .001 (independent samples t-test).