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Table 4 Composite scoresa using three different scaling methods

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

  Baseline Two weeks Four months
Scale Mean SD Mean SD Mean SD
VEINES-QOL
Original 50.0 10.0 50.0 10.0 50.0 10.0
External standardb 50.0 10.0 49.2 10.2 54.5 11.1
Intrinsic 53.6 22.1 51.8 22.7 62.9 24.8
Symptoms
Original 50.0 10.0 50.0 10.0 50.0 10.0
External standardb 50.0 10.0 50.3 10.3 54.8 10.6
Intrinsic 58.4 23.0 59.0 23.8 69.2 24.3
  1. adifferent methods of forming the score may produce different numerical values
  2. bAt baseline the external standard score is identicalto the baselinescore, because the baseline dataset forms the standard reference set