In a large sample of partial hospital patients, the Clinically Useful Depression Outcome Scale (CUDOS-D) was a reliable and valid measure of the DSM-5 symptoms of major depressive disorder (MDD) assessed on a daily basis. 1,115 patients presenting for treatment of MDD completed the CUDOS-D as part of their initial paperwork and on a daily basis thereafter. Test-retest reliability was examined in 50 patients who completed the CUDOS-D twice on the same day. A subset of 69 patients were interviewed by a trained diagnostic rater who administered the 17-item Hamilton Depression Rating Scale (HAMD) at baseline and on the day of discharge. Researchers found:

• The CUDOS-D had high internal consistency and test-retest reliability, and was more highly correlated with another measure of depressive than non-depressive symptoms.
• CUDOS-D scores progressively declined during the course of treatment, and scores on each successive day were significantly lower than the preceding day.
• The change in CUDOS-D scores was significantly correlated with a change in HAMD scores.