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BRIEF COMMUNICATION.

Apparent change in caseness in longitudinal studies

Published online by Cambridge University Press:  01 January 1997

ROB SELZER  and
JOHN B. CARLIN
ROB SELZER
Affiliation:
Centre for Adolescent Health and the Clinical Epidemiology and Biostatistics Unit, Royal Children's Hospital, Melbourne, Victoria, Australia
JOHN B. CARLIN
Affiliation:
Centre for Adolescent Health and the Clinical Epidemiology and Biostatistics Unit, Royal Children's Hospital, Melbourne, Victoria, Australia
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Abstract

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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.

Type
Brief Report
Information
Psychological Medicine , Volume 27 , Issue 1 , January 1997 , pp. 237 - 240
Copyright
© 1997 Cambridge University Press