People with traumatic brain injury (TBI) are twice at the risk for suicide as compared to the people without TBI, according to a new study in the Journal of the American Medical Association.
The researchers conducted the study using nationwide registers covering 7,418,391 individuals living in Denmark with 164,265,624 person-years of follow-up. Of the participants, 7.6 percent had a medical contact for TBI.
- The absolute suicide rate was 41 versus 20 per 100,000 person-years among those with versus without TBI, with an adjusted incidence rate ratio (IRR) of 1.90.
- Severe TBI was associated with an IRR of 2.38 compared with no TBI, whereas mild TBI and skull fracture without documented TBI had IRRs of 1.81 and 2.01, respectively.
- There was a correlation for suicide risk with the number of medical contacts for TBI versus those with no TBI contacts: for one, two, and three or more TBI contacts the IRRs were 1.75, 2.31, and 2.59, respectively.
- Temporal proximity since last medical contact for TBI was associated with suicide risk, with an IRR of 3.67 within the first six months.
“In this nationwide registry-based retrospective cohort study individuals with medical contact for TBI, compared with the general population without TBI, had increased suicide risk,” concluded the authors.
For further information log on to 10.1001/jama.2018.10211