Introducing the composite time trade-off: a test of feasibility and face validity

Abstract

IntroductionThis study was designed to test the feasibility and face validity of the composite time trade-off (composite TTO), a new approach to TTO allowing for a more consistent elicitation of negative health state values.MethodsThe new instrument combines a conventional TTO to elicit values for states regarded better than dead and a lead-time TTO for states worse than dead.ResultsA total of 121 participants completed the composite TTO for ten EQ-5D-5L health states. Mean values ranged from −0.104 for health state 53555 to 0.946 for 21111. The instructions were clear to 98 % of the respondents, and 95 % found the task easy to understand, indicating feasibility. Further, the average number of steps taken in the iteration procedure to achieve the point of indifference in the TTO and the average duration of each task were indicative of a deliberate cognitive process.ConclusionFace validity was confirmed by the high mean values for the mild health states (>0.90) and low mean values for the severe states (<0.42). In conclusion, this study demonstrates the feasibility and face validity of the composite TTO in a face-to-face standardized computer-assisted interview setting.

Long-term mortality and quality of life in intensive care patients treated for pneumonia and/or sepsis

“…Reliability of the EQ-5D questionnaire has been described elsewhere [15]. The EQ-5D index was calculated as previously described [16,17].…”

Interim EQ-5D-5L Value Set for Poland: First Crosswalk Value Set in Central and Eastern Europe

“…These country-specific value sets, obtained from the general population, enable the derivation of index-based utility scores by applying weights to the dimensions and levels described by the EQ-5D health state classifier system when completed by respondents. EQ-5D-5L value sets based on preferences directly elicited from representative general population samples are under development [5][6][7][8][9][10][11].…”

Learning and Satisficing: An Analysis of Sequence Effects in Health Valuation

“…(2, 21–24) Table 1 summarizes the characteristics of these 6 studies. All studies used a computerized instrument that randomized task sequence using national samples of adults from the general population.…”

“…1). (24) The composite TTO is derived from both the original and lead-time TTO. (25–27) Each step displayed 2 scenarios and the respondent was asked, “Which is better?” If the respondent did not wish to choose, the respondent may instead state indifference (i.e., the scenarios were “about the same”).…”