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Construct validity of the interview Time Trade-Off and computer Time Trade-Off in patients with rheumatoid arthritis: A cross-sectional observational pilot study
BMC Musculoskeletal Disorders, 06/29/2012
Buitinga L et al. – Both the interview Time Trade–Off (TTO) and computer TTO showed poor construct validity in RA patients when using measures of healthrelated quality of life, general health, pain and functional status as reference measures. Possibly, the validity of the TTO improves when using an anchor that is more realistic to RA patients than the anchor 'death'.
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