Is the cutoff to define remission on the Hamilton Rating Scale for Depression too high?

The Hamilton Rating Scale for Depression (HRSD) is the most frequently used measure of outcome in antidepressant efficacy trials. More than a decade ago, a consensus panel recommended that remission be defined on the 17-item version of the HRSD as a cutoff <or=7. This recommendation was accompanied by a call for research to validate this cutoff value; however, little research in this area has been performed since then. The goal of the present study was to compare the validity of different HRSD cutoffs for defining remission. Three hundred three depressed psychiatric outpatients were rated on the 17-item HRSD, the Global Assessment of Functioning (GAF) scale, and the Standardized Clinical Outcome Rating for Depression, an index of DSM-IV remission status. We examined the sensitivity, specificity, and overall classification rate of the HRSD for identifying a broad and narrow interpretation of the DSM-IV definition of remission, and the association between the breadth of the definition of remission on the HRSD and self-report ratings of global psychosocial functioning and quality of life. Based on a narrow definition of DSM-IV remission, which requires an absence of clinically significant symptoms of depression, the optimal 17-item HRSD cutoff was <or=2. Compared with patients scoring 3 through 7 on the HRSD, those who scored 0 to 2 reported significantly less psychosocial impairment and better quality of life. Our results thus support the use of a lower cutoff on the HRSD than has been traditionally used to define remission.