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Table 1 Intraclass correlation coefficients and 95% confidence intervals for the consistency of health-related quality-of-life ratings over time and level of agreement between raters, according to health state

From: Reliability of health-related quality-of-life assessments made by older adults and significant others for health states of increasing cognitive impairment

  Current health state Mild to moderate stroke Incurable brain cancer Severe dementia
Consistency over timea
 Older adults 0.55 0.41 0.39 0.49
(0.47, 0.63) (0.32, 0.50) (0.30, 0.48) (0.40, 0.57)
 Proxies 0.55 0.27 0.28 0.20
(0.46, 0.62) (0.16, 0.37) (0.14, 0.41) (0.11, 0.30)
Agreement between ratersb
 T0 0.44 0.16 0.19 0.12
(0.33, 0.53) (0.04, 0.28) (0.06, 0.31) (−0.01, 0.24)
 T1 0.38 0.19 0.01 0.02
(0.25, 0.50) (0.05, 0.33) (−0.13, 0.15) (−0.13, 0.16)
 T2 0.51 0.26 0.23 0.07
(0.40, 0.61) (0.12, 0.39) (0.09, 0.36) (−0.07, 0.22)
  1. aResults derived from a two-way random-effects model
  2. bResults derived from a two-way mixed-effects model