BRIEF COMMUNICATION.

1 January 1997

journal article
research article
Published by Cambridge University Press (CUP) in Psychological Medicine

Vol. 27 (1) , 237-240
https://doi.org/10.1017/s0033291796003546

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.

Keywords

SURVEY
INSTRUMENT
POSITIVE RESPONSES
RESPONSES ARE VERIFIED
BRIEF COMMUNICATION
IMPERFECT VALIDITY
LONGITUDINAL STUDY
SECOND STAGE

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