The comparability and reliability of five health-state valuation methods.

摘要: The objective of the study was to consider five methods for valuing health states with respect their comparability (convergent validity, value functions) and reliability. Valuation tasks were performed by 104 student volunteers using frequently used valuation methods: standard gamble (SG), time trade-off (TTO), rating scale (RS), willingness-to-pay (WTP) paired comparisons method (PC). Throughout study, EuroQol classification system construct 13 health-state descriptions. Validity investigated multitrait-multimethod (MTMM) methodology. extent which results one could be predicted another examined transformations. Reliability studied parametrically Generalisability Theory (an ANOVA extension), as well non-parametrically. Mean values SG slightly higher than TTO values. RS distinguished from other methods. After a simple power transformation, found close TTO. WTP linearly related TTO, except at extremes scale. However, reliability low number inconsistencies substantial. Valuations made proved most reliable. Paired did not provide stable results. In conclusion, parametric transformation function between SG/TTO evidence justify current use (with transformations) only reasons feasibility but also comparability. A definite judgement on PC requires data complete design. Due specific structure correlation matrix is inherent in states, we believe that full MTMM applicable analysis valuations.