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BRIEF COMMUNICATION.
Apparent change in caseness in longitudinal studies
Published online by Cambridge University Press: 01 January 1997
Abstract
Unless positive responses are verified at a second stage of data collection, a questionnaire-based survey has limited ability to assess change in caseness in a longitudinal study of a condition of low prevalence, assuming imperfect validity of the survey instrument.
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- © 1997 Cambridge University Press
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