Department of Psychiatry, University of Copenhagen (Department of Psychiatry, Rigshospitalet, Blegdamsvej 9, DK 2100 Copenhagen Ø, Denmark. Tel: 3545 6237; fax: 3545 6218; e-mail: lars.kessing{at}rh.dk) and Department of Psychiatric Demography, University of Aarhus, Risskov, Denmark
Funding detailed in Acknowledgements.
Background The ICD-10 categorisation of severity of depression into mild, moderate and severe depressive episodes has not been validated.
Aims To validate the ICD-10 categorisation of severity of depression by estimating its predictive ability on the course of illness and suicidal outcome.
Method All psychiatric in-patients in Denmark who had received a diagnosis of a single depressive episode at their first discharge between 1994 and 1999 were identified. The risk of relapse and the risk of suicide were compared for patients discharged with an ICD-10 diagnosis of a single mild, moderate or severe depressive episode.
Results At their first discharge, 1103 patients had an ICD-10 diagnosis of mild depressive episode, 3182 had a diagnosis of moderate depressive episode and 2914 had a diagnosis of severe depressive episode. The risk of relapse and the risk of suicide were significantly different for the three types of depression - increasing from mild to moderate to severe depressive episode.
Conclusions The ICD-10 way of grading severity is clinically useful and should be preserved in future versions.
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