June 1976

The Global Assessment ScaleA Procedure for Measuring Overall Severity of Psychiatric Disturbance

Author Affiliations

From Biometrics Research, New York State Department of Mental Hygiene, New York State Psychiatric Institute, the departments of psychiatry (Drs Endicott and Spitzer) and biostatistics (Dr Fleiss), Columbia University, and the Department of Psychology (Dr Cohen), New York University.

Arch Gen Psychiatry. 1976;33(6):766-771. doi:10.1001/archpsyc.1976.01770060086012

† The Global Assessment Scale (GAS) is a rating scale for evaluating the overall functioning of a subject during a specified time period on a continuum from psychological or psychiatric sickness to health.

In five studies encompassing the range of populations to which measures of overall severity of illness are likely to be applied, the GAS was found to have good reliability. GAS ratings were found to have greater sensitivity to change over time than did other ratings of overall severity or specific symptom dimensions. Former inpatients in the community with a GAS rating below 40 had a higher probability of readmission to the hospital than did patients with higher GAS scores.

The relative simplicity, reliability, and validity of the GAS suggests that it would be useful in a wide variety of clinical and research settings.