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Modelling valuations for the EQ-5D health states: an alternative model using differences in valuations. Jennifer Roberts and Paul Dolan Sheffield Health Economics Group . The EQ-5D. Mobility Self Care Usual Activities Pain/Discomfort Anxiety/Depression
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Modelling valuations for the EQ-5D health states: an alternative model using differences in valuations Jennifer Roberts and Paul Dolan Sheffield Health Economics Group
The EQ-5D • Mobility • Self Care • Usual Activities • Pain/Discomfort • Anxiety/Depression • 3 levels defining problems on each dimension (none, some, a lot).
Motivation • the original EQ-5D study • preference based single index • 42 states (from 243) valued by TTO • i = 2997, j = 12, n = 35,964 • ‘tariff’ produced (Dolan 1997) • predicts mean health state values quite well • despite • enormous variation across individual valuations of states
The data for the new tariff model • all respondents valued 33333 plus 11 others • 2 very mild (n ~ 1200) • 3 each from mild, moderate and severe (n ~ 750) • consider each respondents value of each state as the difference from their value for 33333 • i = 2997, j = 11, n = 32,967 • random effects model used
Conclusion • Lack of consensus on ordering of states has implications for policy decisions … • Two models are similar in structure and findings • New model has better predictive ability • Some important differences arise • difference in health change given by the two tariffs could be as much as 0.245 • Which (if any) is the right model?