Subthreshold depression in the elderly: qualitative or quantitative distinction?

Recent studies revealed that subthreshold depression (or "subclinical" or "subsyndromal" depression) can have clinical validity because it is related to dysfunction and disability and is a risk factor for major depression. However, none of these studies focused on old age. Therefore, one aim of the psychiatric part of the multidisciplinary Berlin Aging Study (BASE) was also to detect milder forms of psychopathological syndromes, especially subthreshold depression, compared with specified forms such as major depression and dysthymia according to the DSM-III-R. The present evaluation shows that subthreshold depression can be characterized in 2 ways: firstly, as a quantitatively minor variant of depression or a depression-like state with fewer symptoms or with less continuity; and secondly, as qualitatively different from major depression with fewer suicidal thoughts or feelings of guilt or worthlessness, while worries about health and weariness of living occur with a similar frequency.