METHODS FOR DISCOUNTING IN ECONOMIC EVALUATION; AN EMPIRICAL COMPARISON OF PREFERENCES IN MONEY AND QUALITY OF LIFE
Author(s)
Parouty M1, Krooshof D2, Westra T3, Postma M41University of Groningen, Groningen, Netherlands, 2University of Groningen, Groningen, groningen, Netherlands, 3University Medical Centre Groningen, Groningen, Netherlands, 4Unit of PharmacoEpidemiology & PharmacoEconomics (PE2), Department of Pharmacy, University of Groningen, Groningen , Netherlands
OBJECTIVES: The need for differential discounting for costs and health outcomes has captured the attention of many health economists. The commonly used methodology for both health and money assumes a constant discount rate. The latter is however scarcely backed up by empirical evidences on time-preference. We aim to validly gather and interpret empirical data for a representative sample of the Dutch population on time preference regarding different future time point. METHODS: Sampling of 850 individuals was managed by Samplingsurvey International (Rotterdam NL, www.surveysamplinginternational.com). Web-based questionnaires were developed paying particular attention to the way questions would be perceived. Questions and analysis were based on a pilot study with considerations on the possibility to elicit time preference separately for money and health and the possibility to elicit indifference amounts for different time points in the future regarding money and quality of life. Exclusion factor was based on the Von Newman-Morgenstern rationality axioms assuming that consumption at different times are different consumptions. Further sorting involved the individual’s optimistic or pessimistic views about the future. RESULTS: Time-preferences for both money and quality of life decrease, with the rate of decline also decreasing, over increasing time of delay. The time-preference for income was found to be higher than that of health. Individuals with low health states had higher discount rates. Females elicited higher discount rates than males. As expected, in the short term, optimistic individuals had higher discount rates than pessimistic ones; although this may reverse in the longer term. More importantly, discount rate for income was higher than that for quality of life. CONCLUSIONS: Empirical evidence collected in this research indicated, similar to the pilot study, that time preferences for income was higher than that of health. In all cases, as often observed, hyperbolic discounting characterised by decreasing rate over increasing delay, was observed.
Conference/Value in Health Info
2012-11, ISPOR Europe 2012, Berlin, Germany
Value in Health, Vol. 15, No. 7 (November 2012)
Code
PRM59
Topic
Methodological & Statistical Research
Topic Subcategory
Modeling and simulation
Disease
Multiple Diseases