The World Health Organization Quality of Life instrument for people with intellectual and physical disabilities (WHOQOL-Dis): evidence of validity of the Brazilian version

Table 11 Test-retest reliability among participants with intellectual disability

Factor/domain (t1-t2) (c)	t-test for paired samples (df = 68)		Intraclass correlation coefficient (ICC)
Factor/domain (t1-t2) (c)	t	d	F (95% CI)
Physical^(a)	−0.05	0.01	0.65** (0.43-0.78)
Psychological^(a)	−033	0.97	0.57** (0.3-0.73)
Social^(a)	−1.52	0.18	0.46* (0.13-0.67)
Environment^(a)	−1.27	0.15	0.64** (0.42-0.78)
Overall^(a)	0.35	0.04	0.48* (0.16-0.68)
Factor 1^(b)	−0.29	0.04	0.48* (0.16-0.68)
Factor 2^(b)	−1.13	0.14	0.58** (0.316-0.74)
Factor 3^(b)	−0.46	0.06	0.72** (0.54-0.82)
Overall^(b)	−34.17**	0.97	0.41* (0.05-0.64)
DISQOL module	−1.04	0.13	0.74** (0.58-0.84)
Local module	−1.09	0.13	0.36* (−0.03-0.6)

^(a)WHOQOL-Bref. ^(b)DISQOL module: factors consistent with those identified in the original cross-cultural project (global sample).
Significance level: *p < 0.05; **p ≤ 0.001 (two-tailed). (c) Mean interval: 28 ± 13.58 days. df = degrees of freedom; d = effect size.

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