Using the Multiple Sclerosis Impact Scale to estimate health state utility values: mapping from the MSIS-29, version 2, to the EQ-5D and the SF-6D

Annie Hawton, Colin Green, Claire Telford, John Zajicek, Dave Wright

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVES: The 29-item Multiple Sclerosis Impact Scale (MSIS-29) is a psychometrically validated patient-reported outcome measure increasingly used in trials of treatments for multiple sclerosis. However, it is non-preference-based and not amenable for use across policy decision-making contexts. Our objective was to statistically map from the MSIS-29, version 2, to the EuroQol five-dimension (EQ-5D) and the six-dimension health state short form (derived from short form 36 health survey) (SF-6D) to estimate algorithms for use in cost-effectiveness analyses.

METHODS: The relationships between MSIS-29, version 2, and EQ-5D and SF-6D scores were estimated by using data from a cohort of people with multiple sclerosis in South West England (n=672). Six ordinary least squares (OLS), Tobit, and censored least adjusted deviation (CLAD) regression analyses were conducted on estimation samples, including the use of subscale and item scores, squared and interaction terms, and demographics. Algorithms from models with the smallest estimation errors (mean absolute error [MAE], root mean square error [RMSE], normalized RMSE) were then assessed by using separate validation samples.

RESULTS: Tobit and CLAD. For the EQ-5D, the OLS models including subscale squared terms, and item scores and demographics performed comparably (MAE 0.147, RMSE 0.202 and MAE 0.147, RMSE 0.203, respectively), and estimated scores well up to 3 years post-baseline. Estimation errors for the SF-6D were smaller (OLS model including squared terms: MAE 0.058, RMSE 0.073; OLS model using item scores and demographics: MAE 0.059, RMSE 0.08), and the errors for poorer health states found with the EQ-5D were less pronounced.

CONCLUSIONS: We have provided algorithms for the estimation of health state utility values, both the EQ-5D and SF-6D, from scores on the MSIS-29, version 2. Further research is now needed to determine how these algorithms perform in practical decision-making contexts, when compared with observed EQ-5D and SF-6D values.

Original languageEnglish
Pages (from-to)1084-91
Number of pages8
JournalValue in Health
Volume15
Issue number8
DOIs
Publication statusPublished - Dec 2012

Keywords

  • Adult
  • Aged
  • Algorithms
  • Cost-Benefit Analysis
  • Female
  • Health Status
  • Humans
  • Longitudinal Studies
  • Male
  • Mental Health
  • Middle Aged
  • Mobility Limitation
  • Models, Statistical
  • Multiple Sclerosis
  • Pain
  • Psychometrics
  • Quality of Life
  • Quality-Adjusted Life Years
  • Socioeconomic Factors
  • Surveys and Questionnaires

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