Table 5.

PedsQL™ 4.0 Generic Core Scales Social Functioning Scale 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	1,288	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

Note: Total N = 13,736 for reliability, Total N = 12,991 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 < .05, **p < .01, ***p < .001 (independent samples t-test).