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The impact of alcohol use disorder and PTSD comorbidity on risk of suicide attempt

Edwards, Alexis C. LU ; Lönn, Sara Larsson LU ; Amstadter, Ananda B. ; Stephenson, Mallory ; Lannoy, Séverine ; Crump, Casey LU ; Sundquist, Jan LU ; Kendler, Kenneth S. and Sundquist, Kristina LU (2026) In Social Psychiatry and Psychiatric Epidemiology
Abstract

Background: Alcohol use disorder (AUD) and posttraumatic stress disorder (PTSD) are frequently comorbid and are individually associated with increased risk of suicidal behavior. However, whether their comorbidity exacerbates this risk has not been adequately investigated. Methods: Using a Swedish birth cohort (born 1970–1990; N = 799,203–858,983), we employed Aalen’s linear hazards models to evaluate the risk of non-fatal suicide attempt (SA) as a function of registration for AUD and/or PTSD. Models were stratified by sex and considered the temporal ordering of AUD and PTSD. We adjusted for registrations of major depression (MD) and other key covariates. Results: The overall incidence of SA ranged from 16.52 to 19.29 per 10,000... (More)

Background: Alcohol use disorder (AUD) and posttraumatic stress disorder (PTSD) are frequently comorbid and are individually associated with increased risk of suicidal behavior. However, whether their comorbidity exacerbates this risk has not been adequately investigated. Methods: Using a Swedish birth cohort (born 1970–1990; N = 799,203–858,983), we employed Aalen’s linear hazards models to evaluate the risk of non-fatal suicide attempt (SA) as a function of registration for AUD and/or PTSD. Models were stratified by sex and considered the temporal ordering of AUD and PTSD. We adjusted for registrations of major depression (MD) and other key covariates. Results: The overall incidence of SA ranged from 16.52 to 19.29 per 10,000 person-years (PY). In models adjusted for MD and other covariates, PTSD accounted for an additional 12.19–22.09 SA cases per 10,000 PY; the corresponding range for AUD was 43.24–80.04, and the difference in effect size across predictors was more pronounced where AUD preceded PTSD. Comorbidity exacerbated risk: The interaction between PTSD and AUD accounted for 71.13-179.41 additional SA cases per 10,000 PY. In secondary models, interactions between AUD and MD conferred additional SA risk (40.50-127.88 additional SA cases per 10,000 PY), while interactions between PTSD and MD were very weak and, in most cases, negative (-13.26-3.29). Conclusions: PTSD and AUD are independently associated with SA, but risk is substantially exacerbated among comorbid individuals. While the total effect of these conditions on SA risk is overall comparable across sexes, females whose PTSD precedes AUD are particularly burdened by comorbidity.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Alcohol use disorder, Comorbidity, Posttraumatic stress disorder, Suicide attempt
in
Social Psychiatry and Psychiatric Epidemiology
publisher
D. Steinkopff-Verlag
external identifiers
  • scopus:105029691223
ISSN
0933-7954
DOI
10.1007/s00127-026-03054-y
language
English
LU publication?
yes
id
752e631a-7e3c-4ce1-94cd-894615889594
date added to LUP
2026-03-02 09:43:40
date last changed
2026-03-02 09:44:43
@article{752e631a-7e3c-4ce1-94cd-894615889594,
  abstract     = {{<p>Background: Alcohol use disorder (AUD) and posttraumatic stress disorder (PTSD) are frequently comorbid and are individually associated with increased risk of suicidal behavior. However, whether their comorbidity exacerbates this risk has not been adequately investigated. Methods: Using a Swedish birth cohort (born 1970–1990; N = 799,203–858,983), we employed Aalen’s linear hazards models to evaluate the risk of non-fatal suicide attempt (SA) as a function of registration for AUD and/or PTSD. Models were stratified by sex and considered the temporal ordering of AUD and PTSD. We adjusted for registrations of major depression (MD) and other key covariates. Results: The overall incidence of SA ranged from 16.52 to 19.29 per 10,000 person-years (PY). In models adjusted for MD and other covariates, PTSD accounted for an additional 12.19–22.09 SA cases per 10,000 PY; the corresponding range for AUD was 43.24–80.04, and the difference in effect size across predictors was more pronounced where AUD preceded PTSD. Comorbidity exacerbated risk: The interaction between PTSD and AUD accounted for 71.13-179.41 additional SA cases per 10,000 PY. In secondary models, interactions between AUD and MD conferred additional SA risk (40.50-127.88 additional SA cases per 10,000 PY), while interactions between PTSD and MD were very weak and, in most cases, negative (-13.26-3.29). Conclusions: PTSD and AUD are independently associated with SA, but risk is substantially exacerbated among comorbid individuals. While the total effect of these conditions on SA risk is overall comparable across sexes, females whose PTSD precedes AUD are particularly burdened by comorbidity.</p>}},
  author       = {{Edwards, Alexis C. and Lönn, Sara Larsson and Amstadter, Ananda B. and Stephenson, Mallory and Lannoy, Séverine and Crump, Casey and Sundquist, Jan and Kendler, Kenneth S. and Sundquist, Kristina}},
  issn         = {{0933-7954}},
  keywords     = {{Alcohol use disorder; Comorbidity; Posttraumatic stress disorder; Suicide attempt}},
  language     = {{eng}},
  publisher    = {{D. Steinkopff-Verlag}},
  series       = {{Social Psychiatry and Psychiatric Epidemiology}},
  title        = {{The impact of alcohol use disorder and PTSD comorbidity on risk of suicide attempt}},
  url          = {{http://dx.doi.org/10.1007/s00127-026-03054-y}},
  doi          = {{10.1007/s00127-026-03054-y}},
  year         = {{2026}},
}