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Bias resulting from missing information: some epidemiological findings
Journal of Epidemiology and Community Health
sumUmARY The biases resulting from missing information were examined in three psychiatric epidemiological studies. In each study, cases with missing information could be compared with the main sample because data were available from several sources or at several points in time through a longitudinal study. In almost all instances, cases with missing data differed systematically in terms of variables crucial to the questions being studied. In general, they tended to include a higher proportiondoi:10.1136/jech.31.2.131 fatcat:df6zxvdeubecvfiarrhfxix4tu