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 2 PedsQL™ 4.0 Generic Core Scales Physical 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	1,290	0.87	77.68	24.25	1.0	24.4	90.04	15.07	0.2	38.9	12.36*	0.82
3 yrs	1,238	0.87	76.17	25.05	0.8	19.3	90.07	14.24	0.0	37.6	13.90*	0.98
4 yrs	1,184	0.89	76.01	24.91	1.8	19.8	89.23	17.00	0.0	42.6	13.22*	0.78
5 yrs	975	0.88	68.79	26.36	1.2	11.3	79.94	20.64	0.0	23.8	11.15*	0.54
6 yrs	1,119	0.87	73.31	23.87	0.4	14.0	80.37	20.76	0.0	21.9	7.06*	0.34
7 yrs	1,084	0.88	70.88	26.23	1.1	14.4	79.52	21.35	0.0	23.3	8.64*	0.40
8 yrs	1,025	0.88	74.25	23.98	0.6	15.0	82.91	19.93	0.0	31.1	8.66*	0.43
9 yrs	963	0.89	70.47	24.86	1.8	12.6	81.52	21.85	0.0	32.0	11.05*	0.51
10 yrs	973	0.88	72.13	24.29	0.9	14.1	84.18	19.11	0.2	32.1	12.05*	0.63
11 yrs	783	0.90	73.29	25.16	1.4	12.8	82.66	20.95	0.2	31.2	9.37*	0.45
12 yrs	765	0.89	69.33	25.30	0.4	8.5	82.36	20.86	0.0	27.6	13.03*	0.62
13 yrs	701	0.89	71.50	23.63	1.4	12.0	82.37	21.67	0.0	32.2	10.87*	0.50
14 yrs	646	0.90	69.70	24.99	0.7	8.6	84.52	19.86	0.0	31.3	14.82*	0.75
15 yrs	617	0.88	72.95	22.16	0.4	8.4	82.43	20.48	0.0	30.0	9.48*	0.46
16 yrs	361	0.89	69.01	25.74	0.5	9.6	85.61	18.07	0.0	31.5	16.60*	0.92

Note: Total N = 13,724 for reliability, Total N = 13,004 for validity.
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