Testerone Levels and Depression in Older Men

Depression in older men has been associated with low circulating testosterone concentration but data from prospective studies are limited. A new study published in the journal Psychoneuroendocrinology described a prospective longitudinal study in a community representative cohort of 3179 older men free of clinically significant depressive symptoms at baseline. The main objective of the study was to determine if low serum testosterone, dihydrotestosterone and estradiol concentrations are associated with the development of depressive symptoms. Incident depression was assessed with the Patient Health Questionnaire and via an electronic health record database (The West Australian Data Linkage System). The main exposures of interest were serum testosterone, dihydrotestosterone and estradiol measured by liquid chromatography–mass spectrometry and calculated free testosterone in baseline blood samples (collected between 2001 and 2004). Results: showed that one hundred and thirty five men (4.2%) developed depression over a median follow up time of 9.4 years (range 8.4–10.9). Men with incident depression were older (median age 77.7 vs 76.1 years, z = −3.82, p = 0 < 0.001) and were more likely to have cardiovascular disease (43.0% vs 32.6%, χ² = 6.32, p = 0.012) and diabetes (22.2% vs 13.2%, χ² = 8.95, p = 0.003). Low serum total testosterone (<6.4nmol/L) was associated with incident depression (HR 2.07, 95%CI 1.17–3.68) and this remained significant after adjustment for relevant potential confounding factors (HR 1.86, 95%CI 1.05–3.31). Low serum dihydrotestosterone, estradiol and calculated free testosterone were not associated with risk of depression. Conclusions: Low serum total testosterone, but not calculated free testosterone, was associated with incident depression in this sample of older men.

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