A diagnostic interview: the schedule for affective disorders and schizophrenia.

The Schedule for Affective Disorders and Schizophrenia (SADS) was developed to reduce information variance in both the descriptive and diagnostic evaluation of a subject. The SADS is unique among rating scales in that it provides for (1) a detailed description of the features of the current episodes of illness when they were at their most severe; (2) a description of the level of severity of manifestations of major dimensions of psychopathology during the week preceding the evaluation, which can then be used as a measure of change; (3) a progression of questions and criteria, which provides information for making diagnoses; and (4) a detailed description of past psychopathology and functioning relevant to an evaluation of diagnosis, prognosis, and overall severity of disturbance. This article reports on initial scale development and reliability studies of the items and the scale scores.