Quality of Life Research

, Volume 23, Issue 8, pp 2365–2374

Using WOMAC Index scores and personal characteristics to estimate Assessment of Quality of Life utility scores in people with hip and knee joint disease

  • Ilana N. Ackerman
  • Mark A. Tacey
  • Zanfina Ademi
  • Megan A. Bohensky
  • Danny Liew
  • Caroline A. Brand
Article

Abstract

Purpose

To determine whether Assessment of Quality of Life (AQoL) utility scores can be reliably estimated from Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores in people with hip and knee joint disease (arthritis or osteoarthritis).

Methods

WOMAC and AQoL data were analysed from 219 people recruited for a national population-based study. Generalised linear models were used to estimate AQoL utility scores based on WOMAC total and subscale scores and personal characteristics. Goodness of fit was assessed for each model, and plots of prediction errors versus actual AQoL utility scores were used to gauge bias.

Results

Each model closely predicted the average AQoL utility score for the overall sample (actual mean AQoL 0.64, range of predicted means 0.63–0.64; actual median AQoL 0.71, range of predicted medians 0.68–0.69). No clear preferred model was identified, and overall, the models predicted 40–46 % of the variance in AQoL utility scores. The WOMAC function subscale model performed similarly to the total score model. The models functioned best at the mid-range of AQoL scores, with greater bias observed for extreme scores. Inaccuracies in individual-level estimates and low/high health-related quality of life (HRQoL) subgroup estimates were evident.

Conclusion

Reliable overall group-level estimates were produced, supporting the application of these techniques at a population level. Using WOMAC scores to predict individual AQoL utility scores is not recommended, and the models may produce inaccurate estimates in studies targeting patients with low/high HRQoL. Where pain and stiffness data are unavailable, the WOMAC function subscale can be used to generate a reasonable utility estimate.

Keywords

Arthritis Osteoarthritis Outcome measures Quality of life 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Ilana N. Ackerman
    • 1
  • Mark A. Tacey
    • 1
  • Zanfina Ademi
    • 1
    • 2
  • Megan A. Bohensky
    • 1
  • Danny Liew
    • 1
  • Caroline A. Brand
    • 1
  1. 1.Melbourne EpiCentre, Department of Medicine (Royal Melbourne Hospital)The University of Melbourne and Melbourne HealthParkvilleAustralia
  2. 2.Department of Epidemiology and Preventive MedicineMonash UniversityMelbourneAustralia

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