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Table 1 PedsQL™ 4.0 Generic Core Scales Total 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 1,277 0.89 79.16 17.61 0.0 8.6 88.14 12.11 0.0 15.8 8.98* 0.74
3 yrs 1,232 0.90 76.90 18.15 0.0 5.7 87.96 11.63 0.0 13.4 11.06* 0.95
4 yrs 1,177 0.90 76.03 19.34 0.0 4.6 87.37 12.67 0.0 14.1 11.34* 0.90
5 yrs 893 0.92 70.57 19.19 0.4 1.6 79.91 15.85 0.0 7.6 9.34* 0.59
6 yrs 1,105 0.91 72.98 17.14 0.0 2.1 79.74 15.86 0.0 5.5 6.76* 0.43
7 yrs 1,061 0.92 70.04 19.12 0.0 2.7 78.59 16.53 0.0 8.0 8.55* 0.52
8 yrs 1,009 0.92 72.51 17.58 0.0 3.4 80.23 15.94 0.0 8.9 7.72* 0.48
9 yrs 952 0.92 69.34 18.32 0.4 0.7 78.89 17.07 0.0 7.5 9.55* 0.56
10 yrs 955 0.92 70.23 18.51 0.0 2.8 80.68 15.73 0.0 8.2 10.45* 0.66
11 yrs 768 0.93 71.26 18.71 0.0 2.1 80.95 16.39 0.0 9.4 9.69* 0.59
12 yrs 753 0.93 68.75 19.14 0.0 1.5 80.77 16.39 0.0 8.7 12.02* 0.73
13 yrs 692 0.93 71.11 18.24 0.0 1.4 80.24 17.02 0.0 9.8 9.13* 0.54
14 yrs 633 0.92 69.09 18.39 0.0 1.8 82.32 14.94 0.0 9.1 13.23* 0.89
15 yrs 605 0.93 71.20 17.48 0.4 1.2 80.67 16.42 0.0 12.7 9.47* 0.58
16 yrs 352 0.93 69.13 19.35 0.0 1.0 82.73 14.43 0.0 10.9 13.60* 0.94
  1. Note: Total N = 13,464 for reliability, Total N = 13,028 for validity.
  2. For the reliability analysis for the 2 to 4 age subgroups, items on the School Functioning Scale were excluded from the analysis given that toddlers do not necessarily attend school or daycare and thus, depending on whether their child was enrolled in school or daycare, parent proxy respondents were given the option of completing the School Functioning items.
  3. Higher values equal better health-related quality of life.
  4. % Floor/Ceiling = the percentage of scores at the extremes of the scaling range.
  5. Effect sizes are designated as small (.20), medium (.50), and large (.80).
  6. *p < .001 (independent samples t-test). f