The course of schizophrenia: Some remarks on a yet unsolved problem of retrospective data collection |
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Authors: | Wolfram an der Heiden Bertram Krumm |
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Institution: | (1) Schizophrenia Research Unit, Central Institute of Mental Health, P.O. Box 122120, W-6800 Mannheim 1, Federal Republic of Germany |
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Abstract: | Summary The retrospective assessment of symptoms and syndromes is a basic measure in research of the longitudinal course of schizophrenia. In spite of its importance there have been few studies evaluating the standard of quality of instruments for retrospective data collection. Combining retrospectively and cross-sectionally collected data on schizophrenic symptomatology in a cohort study over a period of 5 years revealed a significant underestimation of symptoms when assessed in retrospect. The need for studies on the validity of instruments for the retrospective assessment of symptoms is stressed. |
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Keywords: | Schizophrenia Symptomatology Retrospective assessment Validity |
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