Diabetes and quality of life: Comparing results from utility instruments and Diabetes-39

Gang Chen, Angelo Anthony Iezzi, John Rodney Mckie, Munir Ahmed Khan, Jeffrey Ralph James Richardson

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

To compare the Diabetes-39 (D-39) with six multi-attribute utility (MAU) instruments (15D, AQoL-8D, EQ-5D, HUI3, QWB, and SF-6D), and to develop mapping algorithms which could be used to transform the D-39 scores into the MAU scores. Self-reported diabetes sufferers (N = 924) and members of the healthy public (N = 1760), aged 18 years and over, were recruited from 6 countries (Australia 18 , USA 18 , UK 17 , Canada 16 , Norway 16 , and Germany 15 ). Apart from the QWB which was distributed normally, non-parametric rank tests were used to compare subgroup utilities and D-39 scores. Mapping algorithms were estimated using ordinary least squares (OLS) and generalised linear models (GLM). MAU instruments discriminated between diabetes patients and the healthy public; however, utilities varied between instruments. The 15D, SF-6D, AQoL-8D had the strongest correlations with the D-39. Except for the HUI3, there were significant differences by gender. Mapping algorithms based on the OLS estimator consistently gave better goodness-of-fit results. The mean absolute error (MAE) values ranged from 0.061 to 0.147, the root mean square error (RMSE) values 0.083 to 0.198, and the R-square statistics 0.428 and 0.610. Based on MAE and RMSE values the preferred mapping is D-39 into 15D. R-square statistics and the range of predicted utilities indicate the preferred mapping is D-39 into AQoL-8D. Utilities estimated from different MAU instruments differ significantly and the outcome of a study could depend upon the instrument used. The algorithms reported in this paper enable D-39 data to be mapped into utilities predicted from any of six instruments. This provides choice for those conducting cost-utility analyses.
Original languageEnglish
Pages (from-to)326 - 333
Number of pages8
JournalDiabetes Research and Clinical Practice
Volume109
Issue number2
DOIs
Publication statusPublished - 2015

Cite this