Psychometric properties of the Depressive Symptom Assessment for Older Adults in individuals with moderate or severe dementia.

Many older adults with moderate or severe dementia also have depression, but identifying depressive symptoms in these individuals can be challenging. The Depressive Symptom Assessment for Older Adults (DSA), a newly developed instrument designed to evaluate older adults for depression, regardless of their cognitive status, facilitates longitudinal evaluation. This investigation examined the psychometric properties of the DSA in older adults (n = 68) with moderate or severe dementia. Internal consistency for the overall instrument and three of the six subscales, inter-rater reliability, and concurrent validity were established. Preliminary factor analysis yielded two strong factors; however, the other four factors were conceptually unclear. Although the DSA performed well statistically, the instrument may have over-identified depressive symptoms related to disagreeable behavior and lethargy and may have under-identified other depressive symptoms.