• R Michael Bagby, Andrew G Ryder, Deborah R Schuller, and Margarita B Marshall.
• Centre for Addiction and Mental Health, 250 College St., Toronto, Ont., Canada M5T 1R8. michael_bagby@camh.net
• Am J Psychiatry. 2004 Dec 1;161(12):2163-77.

ObjectiveThe Hamilton Depression Rating Scale has been the gold standard for the assessment of depression for more than 40 years. Criticism of the instrument has been increasing. The authors review studies published since the last major review of this instrument in 1979 that explicitly examine the psychometric properties of the Hamilton depression scale. The authors' goal is to determine whether continued use of the Hamilton depression scale as a measure of treatment outcome is justified.MethodMEDLINE was searched for studies published since 1979 that examine psychometric properties of the Hamilton depression scale. Seventy studies were identified and selected, and then grouped into three categories on the basis of the major psychometric properties examined-reliability, item-response characteristics, and validity.ResultsThe Hamilton depression scale's internal reliability is adequate, but many scale items are poor contributors to the measurement of depression severity; others have poor interrater and retest reliability. For many items, the format for response options is not optimal. Content validity is poor; convergent validity and discriminant validity are adequate. The factor structure of the Hamilton depression scale is multidimensional but with poor replication across samples.ConclusionsEvidence suggests that the Hamilton depression scale is psychometrically and conceptually flawed. The breadth and severity of the problems militate against efforts to revise the current instrument. After more than 40 years, it is time to embrace a new gold standard for assessment of depression.

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