Norwegian male military veterans show low levels of mental health problems four years after deployment in Afghanistan.

Background: Deployment of soldiers is associated with considerable rates of mental disorders after redeployment.

Aims: The aim of this study was to identity prevalence of probable mental disorders and associated factors among male Norwegian soldiers at a mean of 4 years following deployment to Afghanistan in 2001-2011.

Methods: The retrospective questionnaire-based study invited all Norwegian veterans deployed to Afghanistan from 2001-2011 to participate.