Med Decis Making - A note on the expected biases in conventional iterative health state valuation protocols.

Tópicos

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{ research(1085) discuss(1038) issu(1018) }
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{ cancer(2502) breast(956) screen(824) }
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Resumo

CKGROUND: Typical health state valuation exercises use tradeoff methods, such as the time tradeoff or the standard gamble, involving a series of iterated questions so that a value for each health state by each individual respondent is elicited. This iterative process is a source of potential biases, but this has not received much attention in the health state valuation literature. The issue has been researched widely in the contingent valuation (CV) literature, which elicits the monetary value of hypothetical outcomes.METHODS: The lessons learned in the CV literature are revisited in the context of the design and administration of health state valuations. The article introduces the main known biases in the CV literature and then examines how each might affect conventional iterative health state valuations.RESULTS: Of the 8 main types of biases, starting point bias, range bias, and incentive incompatibility bias are found to be potentially relevant. Furthermore, the magnitude and direction of the bases are unlikely to be uniform and depend on the range of the value (e.g., between 0 and 0.5). Limitation. This is an overview article, and the conclusions drawn need to be tested empirically.CONCLUSIONS: Health state valuation studies, like CV studies, are susceptible to a number of possible biases that affect the resulting values. Their magnitude and direction are unlikely to be uniform, and thus empirical studies are needed to diagnose the problem and, if necessary, to address it.

Resumo Limpo

ckground typic health state valuat exercis use tradeoff method time tradeoff standard gambl involv seri iter question valu health state individu respond elicit iter process sourc potenti bias receiv much attent health state valuat literatur issu research wide conting valuat cv literatur elicit monetari valu hypothet outcomesmethod lesson learn cv literatur revisit context design administr health state valuat articl introduc main known bias cv literatur examin might affect convent iter health state valuationsresult main type bias start point bias rang bias incent incompat bias found potenti relev furthermor magnitud direct base unlik uniform depend rang valu eg limit overview articl conclus drawn need test empiricallyconclus health state valuat studi like cv studi suscept number possibl bias affect result valu magnitud direct unlik uniform thus empir studi need diagnos problem necessari address

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