• T Laukkala, K Parkkola, M Henriksson, S Pirkola, N Kaikkonen, E Pukkala, and P Jousilahti.
• Centre for Military Medicine, Finnish Defence Forces, Helsinki, Finland.
• BMJ Open. 2016 Oct 31; 6 (10): e012146.

ObjectivesTo estimate total and cause-specific mortality after international peacekeeping deployments among the Finnish military peacekeeping personnel in comparison to the general population of similar age and sex.DesignA register-based study of a cohort of military peacekeeping personnel in 1990-2010 followed for mortality until the end of 2013. Causes of death were obtained from the national Causes of Death Register. The standardised mortality ratio (SMR) for total and cause-specific mortality was calculated as the ratio of observed and expected number of deaths.SettingFinland (peacekeeping operations in different countries in Africa, Asia and in an area of former Yugoslavia in Europe).Participants14 584 men and 418 women who had participated in international military peacekeeping operations ending between 1990 and 2010.InterventionsParticipation in military peacekeeping operations.Main OutcomeTotal and cause-specific mortality.Results209 men and 3 women died after their peacekeeping service. The SMR for all-cause mortality was 0.55 (95% CI 0.48 to 0.62). For the male peacekeeping personnel, the SMR for all diseases was 0.44 (95% CI 0.35 to 0.53) and for accidental and violent deaths 0.69 (95% CI 0.57 to 0.82). The SMR for suicides was 0.71 (95% CI 0.53 to 0.92).ConclusionsEven though military peacekeeping personnel are working in unique and often stressful conditions, their mortality after their service is lower compared with the general population. Military peacekeeping personnel appear to be a selected population group with low general mortality and no excess risk of any cause of death after peacekeeping service.Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/.

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