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Clinical Global Impressions (CGI)

Full name of scale

CGI (all)– Clinical Global Impression

Languages

English and French, over 35 languages

Rater

Clinician-rated

Training

Training required

Utility

Amongst the most widely used of extant brief assessment tools in psychiatry.

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The main purpose is to provide a global rating of illness severity, improvement, and response to treatment. The CGI is a 3-item observer-rated scale that measures illness severity (CGIS), global improvement or change (CGIC) and therapeutic response.

Used in clinical trials, with all research populations; used for measurement-based care

Time to complete

Approximately 1-5 minutes. Varies with familiarity with patient

Cost/license

Open Access. For different version and languages:

Guy, W. (1976). ECDEU assessment manual for psychopharmacology. US Department of Health, Education, and Welfare, Public Health Service ….

Spearing, M. K., Post, R. M., Leverich, G. S., Brandt, D., & Nolen, W. (1997). Modification of the Clinical Global Impressions (CGI) Scale for use in bipolar illness (BP): The CGI-BP. Psychiatry Research, 73(3), 159–171.

Haro, J. M., Kamath, S. A., Ochoa, S. O., Novick, D., Rele, K., Fargas, A., … Kharbeng, A. (2003). The Clinical Global Impression–Schizophrenia scale: A simple instrument to measure the diversity of symptoms present in schizophrenia. Acta Psychiatrica Scandinavica, 107, 16–23.

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