Line staff use of the behavioral observation system: assessment of depression scale validity and cut scores

The Behavioral Observation System (BOS) is an objective behavioral tool used by non-degreed line staff to assess depression, mania, psychosis, and acting out in psychiatric inpatients. The current study uses the Beck Depression Inventory (BDI)-1A to provide evidence for convergent validity for the BOS Depression Scale and to determine effective cut-scores to assist in BOS interpretation. Findings support substantial correlational agreement between the BOS Depression Scale and the BDI. A discriminant function analysis established a "hit rate" of 82% using a Depression Scale score of 7 or greater to identify those with at least moderate levels of depression. The study data lend further credibility to the use of non-degreed line staff as a source of data that can aid in treatment decisions.