Clinical Global Impression scale
Clinical Global Impressions (CGI)
Main reference: Guy W: ECDEU Assessment Manual for Psychopharmacology - Revised (DHEW Publ No ADM 76-338). Rockville, MD, U.S. Department of Health, Education, and Welfare, Public Health Service, Alcohol, Drug Abuse, and Mental Health Administration, NIMH Psychopharmacology Research Branch, Division of Extramural Research Programs, 1976, pp 218-222.
Type: Clinician-rated scale.
Main indications: Designed to assess global severity of illness and change in the clinical condition over time.
Rating performed by: Trained rater.
Time period covered by scale: Current clinical state.
Time required to complete rating: 1-2 minutes after a clinical interview.
Remarks: Standardized assessment tool. Consists of 3 global subscales:
- Severity of illness
- Global improvement
- Efficacy index
Used widely in psychopharmacology trials.
Published on CNSforum 19 Jul 2004