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The association between suicidal ideation and increased mortality from natural causes
Philip J Batterham1, Alison L Calear, Andrew J Mackinnon
1Centre for Mental Health Research, The Australian National University, Canberra, Australian Capital Territory, Australia. philip.batterham@anu.edu.au
Journal of Affective Disorders
|April 27, 2013
Summary
Suicidal ideation increases the risk of death from natural causes, particularly heart disease, even after accounting for health factors. This highlights the importance of assessing suicidal thoughts in older adults.
Area of Science:
- Gerontology
- Public Health
- Psychiatry
Background:
- Suicidal ideation is linked to increased suicide mortality, but its impact on natural cause mortality is understudied.
- Existing research has not evaluated the association between suicidal ideation and all-cause or cause-specific natural mortality.
- This study investigates the independent effect of suicidal ideation on natural mortality in older adults.
Purpose of the Study:
- To determine if suicidal ideation is associated with increased mortality from all natural causes or specific natural causes.
- To identify potential mechanisms linking suicidal ideation to natural mortality by adjusting for demographic, mental health, and physical health factors.
Main Methods:
- A longitudinal community-based cohort study of 861 older adults in Australia.
- Follow-up duration of up to 17 years, with vital status and cause of death data from a national death registry.
Main Results:
- Suicidal ideation was associated with a 23% increased risk of mortality from natural causes (p=0.034) after adjusting for covariates.
- The elevated natural cause mortality was primarily driven by deaths from heart disease (hazard ratio=1.43, p=0.041).
Conclusions:
- Suicidal ideation independently predicts increased natural cause mortality in older adults, beyond physical and mental health status.
- While health factors partially explained the association, suicidal thoughts remained a significant risk factor.
- Future research should explore the role of health behaviors as potential mediators in this relationship.
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