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Table 11 Test-retest reliability among participants with intellectual disability

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

Factor/domain (t1-t2) (c) t-test for paired samples (df = 68) Intraclass correlation coefficient (ICC)
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)
  1. (a)WHOQOL-Bref. (b)DISQOL module: factors consistent with those identified in the original cross-cultural project (global sample).
  2. Significance level: *p < 0.05; **p ≤ 0.001 (two-tailed). (c) Mean interval: 28 ± 13.58 days. df = degrees of freedom; d = effect size.