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Table 7 Intraclass correlation coefficients, within subject standard deviation, and repeatability coefficient for 2-week test-retest reliability for VEINES-QOL and VEINES-Sym

From: Validation of the VEINES-QOL quality of life instrument in venous leg ulcers: repeatability and validity study embedded in a randomised clinical trial

Scale and scoring ICCa SE 95 % CI Within-subject SD Repeatability coefficientb
VEINES-QOL
Original 0.80 0.019 0.76–0.83 4.5 12.5
External standard 0.79 0.019 0.75–0.83 4.6 12.8
Intrinsic 0.78 0.020 0.74–0.82 10.6 29.4
VEINES-Sym
Original 0.75 0.022 0.71–0.79 5.0 13.8
External standard 0.75 0.022 0.71–0.79 5.1 14.1
Intrinsic 0.74 0.023 0.69–0.79 11.9 33.0
  1. aICC = intraclass correlation coefficient, which lies between 0 and 1.0. For acceptable repeatability this should be greater than 0.070
  2. b95 % of pairs of replicate measurements on the same person will be less than this, so a larger difference would indicate a change in quality of life