The feasibility, validity and reliability of the Time Trade-Off (TTO) and Visual Analogue Scale (VAS) methods in obtaining preference values for health states were compared in a random sample of the ...

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Objective: To evaluate the reliability and validity of a brief physical activity assessment tool suitable for doctors to use to identify inactive patients in the primary care setting. Methods: ...

Objective: To provide additional validity data for the Asthma Control Test TM (ACT) using a different criterion measure, setting, and population. Study Design: Cross-sectional survey. Methods: ...