Low vitamin D status and suicide: a case-control study of active duty military service members.
Publication Status: Published
Sponsoring Organization: Defense Health Agency (formerly TRICARE Management Activity)
Sponsoring Office: Uniformed Services University of Health Sciences
Congressionally Mandated: No
Funding Source: Government, academic, or industry source other than Federal Government
Release Date/Publication: January 01, 2013
Principle Investigator Status: Government
Primary DoD Data Source: Defense Medical Surveillance System
Secondary DoD Data Source:
Abstract
OBJECTIVE: Considering that epidemiological studies show that suicide rates in many countries are highest in the spring when vitamin D status is lowest, and that low vitamin D status can affect brain function, we sought to evaluate if a low level of 25-hydroxyvitamin D [25(OH)D] could be a predisposing factor for suicide.
METHOD: We conducted a prospective, nested, case-control study using serum samples stored in the Department of Defense Serum Repository. Participants were previously deployed active duty US military personnel (2002-2008) who had a recent archived serum sample available for analysis. Vitamin D status was estimated by measuring 25(OH) D levels in serum samples drawn within 24 months of the suicide. Each verified suicide case (n = 495) was matched to a control (n = 495) by rank, age and sex. We calculated odds ratio of suicide associated with categorical levels (octiles) of 25(OH) D, adjusted by season of serum collection.
FINDINGS: More than 30% of all subjects had 25(OH)D values below 20 ng/mL. Although mean serum 25(OH)D concentrations did not differ between suicide cases and controls, risk estimates indicated that subjects in the lowest octile of season-adjusted 25(OH)D (<15.5 ng/mL) had the highest risk of suicide, with subjects in the subsequent higher octiles showing approximately the same level of decreased risk (combined odds ratio compared to lowest octile = 0.49; 95% C.I.: 0.315-0.768).
CONCLUSIONS: Low vitamin D status is common in active duty service members. The lowest 25(OH)D levels are associated with an increased risk for suicide. Future studies could determine if additional sunlight exposure and vitamin D supplementation might reduce suicide by increasing 25(OH) D levels.
Citation:
Umhau JC, George DT, Heaney RP, Lewis MD, Ursano RJ, Heilig M, Hibbeln JR, Schwandt ML. Low vitamin D status and suicide: a case-control study of active duty military service members. PLoS One. 2013;8(1):e51543.