title: The duration effect: a link between TTO and VAS values.
abstract: The value of a health state may depend on how long an individual has had to endure the health state (i.e. hedonic load). In this paper, we test the constant proportionality (CP) assumption and determine the sign of relationship between duration and health state value for 42 health states using the nationally representative data from the United Kingdom Measurement and Valuation of Health study. The results reject the CP assumption and suggest that the relationship is negative for optimal health (i.e. fair innings argument) and that the relationship is positive for poorer health states (i.e. adaptation). We find no evidence of the maximum endurable time hypothesis using these data. This evidence on the duration effect has important implications for outcomes research and the economic evaluation of interventions.
authors: Health Outcomes and Behavior Program, Moffitt Cancer Center, Tampa, FL 33612-9416, USA. Benjamin.Craig@moffitt.org
authors: Benjamin M
authors: BM
authors: Craig
mesh_terms: D001294:Attitude to Health; D015982:Bias; D003657:Decision Making; D017050:Episode of Care; D006801:Humans; D008960:Models, Psychological; D017063:Outcome Assessment, Health Care / Q000379:methods* / Q000706:statistics & numerical data; D010147:Pain Measurement; D011594:Psychometrics / Q000295:instrumentation / Q000379:methods; D019057:Quality-Adjusted Life Years; D020379:Risk Adjustment; D018434:Sickness Impact Profile; D016019:Survival Analysis; D013997:Time Factors; D006113:United Kingdom; D026712:Value of Life