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Table 4 Instruments' properties and the scores of the study population: priority and HRQOL

From: Prioritisation of patients on waiting lists for hip and knee arthroplasties and cataract surgery: Instruments validation

   Instrument properties Observed scores
Instruments Procedure Possible range Floor effect (%) Ceiling effect (%) N Mean (SD) Minimum Median Maximum
Prioritisation          
   Prioritisation instrument Arthroplasty 100-0 0.9 0.4 785 49.4 (22.0) 0 49.0 100
  Cataract   0.0 4.6 1,547 35.3 (23.0) 0 35.0 99
   Doctor's opinion on surgical priority (VAS) Arthroplasty 10-0 0.2 0.7 881 5.9 (1.9) 0 5.9 10
  Cataract   0.3 3.3 1,378 4.5 (2.3) 0 4.5 10
HRQOL          
   HUI31 Arthroplasty 0–1 0.0 0.5 196 0.57 (0.20) 0.12 0.58 1
  Cataract   0.0 2.8 569 0.69 (0.22) 0.08 0.70 1
   EQ-5D1 Arthroplasty -0,08–1 0.6 0.6 347 0.37 (0.19) -0.08 0.27 1
  Cataract   0.0 23.0 934 0.69 (0.24) 0.01 0.70 1
   WOMAC Arthroplasty 96-0 0.2 0.3 938 53.9 (17.6) 0 55.0 96
   Pain2   20-0 0.5 1.4 939 10.3 (4.0) 0 10.0 20
   Stiffness2   8-0 43.8 1.9 938 2.3 (2.4) 0 2.0 8
   Function2   68-0 0.2 0.8 939 41.3 (13.0) 0 42.0 68
   VF-14 Cataract 0–100 0.3 5.0 1,669 59.9 (25.5) 0 60.4 100
  1. HRQOL: health-related quality of life; VAS: visual analogue scale; HUI3: Health Utilities Index Mark 3; VF-14: Visual Function Index VF-14; WOMAC: Western Ontario McMaster Osteoarthritis Index.
  2. 1 The utility functions used have been adapted to the Spanish population. References 20 and 21.
  3. 2 WOMAC questionnaire dimensions.