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

Table 3 PedsQL™ 4.0 Generic Core Scales Psychosocial Health Summary Score: Parent Proxy-Report Reliability and Validity

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	1,282	0.81	79.90	15.34	0.0	10.7	86.83	12.41	0.0	19.6	6.93*	0.56
3 yrs	1,239	0.81	77.32	16.29	0.0	7.8	86.41	12.16	0.1	16.0	9.09*	0.75
4 yrs	1,178	0.82	75.98	17.79	0.0	6.9	86.17	12.34	0.0	16.1	10.19*	0.83
5 yrs	897	0.87	71.66	18.30	0.4	2.3	79.87	15.15	0.0	8.8	8.21*	0.54
6 yrs	1,111	0.86	73.02	16.49	0.0	3.7	79.37	15.26	0.0	7.3	6.35*	0.42
7 yrs	1,063	0.88	69.61	18.56	0.0	3.0	78.08	16.11	0.0	8.9	8.47*	0.53
8 yrs	1,011	0.87	71.66	17.10	0.0	3.7	78.82	16.04	0.0	10.4	7.16*	0.45
9 yrs	958	0.87	68.98	17.68	0.4	0.7	77.39	16.81	0.0	9.2	8.41*	0.50
10 yrs	964	0.88	69.35	18.72	0.0	3.4	78.83	16.14	0.0	9.6	9.48*	0.59
11 yrs	769	0.88	70.18	18.13	0.0	3.2	80.00	16.22	0.0	11.0	9.82*	0.61
12 yrs	757	0.90	68.51	18.28	0.0	1.8	79.86	16.18	0.0	10.8	11.35*	0.70
13 yrs	693	0.89	70.91	18.45	0.0	2.4	79.07	17.18	0.0	11.3	8.16*	0.47
14 yrs	633	0.89	68.76	18.35	0.0	3.9	81.08	15.11	0.0	11.4	12.32*	0.82
15 yrs	611	0.89	70.22	17.85	0.4	1.2	79.62	16.51	0.0	15.9	9.40*	0.57
16 yrs	354	0.89	68.98	19.38	0.0	3.5	81.23	14.75	0.0	11.5	12.25*	0.83

Note: Total N = 13,520 for reliability, Total N = 13,019 for validity.
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. Higher values equal better health-related quality of life.
% Floor/Ceiling = the percentage of scores at the extremes of the scaling range.
Effect sizes are designated as small (.20), medium (.50), and large (.80).
*p < .001 (independent samples t-test).

ISSN: 1477-7525