Journal
ACTA PSYCHIATRICA SCANDINAVICA
Volume 147, Issue 2, Pages 175-185Publisher
WILEY
DOI: 10.1111/acps.13512
Keywords
cohort studies; comorbidity; depression; depressive disorder; mortality
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Individuals with depression, specifically melancholic subtype, have a higher risk of mortality compared to non-depressed individuals. The underlying pathophysiological differences between depressive subtypes may contribute to this phenomenon.
Background Individuals with depression and depressive symptoms have a higher mortality rate than non-depressed individuals. The increased comorbidity and mortality associated with depression has remained largely unexplained. The underlying pathophysiological differences between depressive subtypes, melancholic and non-melancholic, may provide some explanation to this phenomenon. Methods One thousand nine hundred and ninety five participants (mean age 61 years) from the Helsinki Birth Cohort Study were recruited for this prospective study and followed up for a mean of 14.1 years. Information regarding medical history, lifestyle, and biochemical parameters were obtained. Depressive symptoms were assessed using the Beck Depression Inventory. Standardized mortality ratios were calculated. Results Participants were followed up for a total of 28,044 person-years. The melancholic depressive group had an increased adjusted risk of mortality [HR 1.49 (95% CI: 1.02-2.20)] when compared to the non-depressive group. Comparing mortality to the whole population of Finland using standardized mortality ratios (SMR) both the non-melancholic [1.11 (95% CI: 0.85-1.44)] and melancholic depressive [1.26 (95% CI: 0.87-1.81)] groups had higher mortality than the non-depressive group [0.82 (95% CI: 0.73-0.93)]. Conclusions Melancholic depressive symptoms are most strongly related to a higher mortality risk.
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