Abstract

There is a debate about the importance of subsyndromal symptoms of depression (SSD). The current study examined the cross-sectional and longitudinal significance of SSD in geriatric subjects both with and without a past history of major depression. Elderly primary-care subjects with SSD, both with (SSD+; N=54) and without (SSD-; N=204) a history of major depression, were compared with subjects with major depression (MDD; N=111), minor depression (MinD; N=74), and symptom-free comparison subjects (N=59). Assessment domains included physical and psychological disability, health-care utilization, hopelessness, death and suicidal ideation, and a diagnostic evaluation at a 3-month follow-up. Both subjects with SSD+ and SSD- differed from the symptom-free comparison subjects on measures of psychological disability, hopelessness, and death ideation, with SSD+ subjects being more severely psychologically disabled than SSD- subjects. There were few differences between SSD+ and MinD subjects or those with MDD, except on measures of psychological disability. Finally, more than 24% of SSD+ subjects progressed to meet criteria of MDD, MinD, or dysthymia over a 3-month period. Utilization of outpatient services did not differ among any of the depression groups or comparison subjects. SSD (with or without a past history of MDD) is associated with significant disability. Moreover, the risk of developing a diagnosis of MDD, MinD, or dysthymia is substantially elevated in subjects with a past history of MDD.

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