Validity of a self-report depression symptom scale for identifying remission in depressed outpatients

In treatment studies of depression, remission is usually defined by scoring less than a threshold value on an interview-based measure of depression severity such as the Hamilton Rating Scale for Depression (HRSD). Although it has been recommended that measures such as the HRSD be used by clinicians in clinical practice to evaluate remission status, the time demands of clinical practice limit the feasibility of this suggestion. Self-report questionnaires are a cost-effective option to thoroughly, systematically, reliably, and validly evaluate clinical status because they are inexpensive in terms of professional time needed for administration and do not require special training for administration. In a previous report from the Rhode Island Methods to Improve Diagnostic Assessment and Services project, we derived a cutoff on a self-report depression questionnaire corresponding to the widely used definition of remission on the HRSD (ie, < or = 7). In the present report, we examined the validity of this questionnaire as an indicator of remission among patients who responded to antidepressant treatment. Specifically, we examined psychosocial functioning in treatment responders who were and were not in remission according to the self-report symptom scale. In a sample of 371 depressed outpatients who were judged by their treating psychiatrists as having responded to treatment, 250 scored in the remission range on the symptom scale. Compared with treatment responders whose depression was not in remission, the patients who were in remission reported significantly less psychosocial impairment and significantly better quality of life and were significantly more likely to assert that they are in remission from their depression. These findings support the validity of a self-report depression questionnaire as an index of remission status among treatment responders.