• Tsuyoshi Hamano, Xinjun Li, Sara Larsson Lönn, Toru Nabika, Kuninori Shiwaku, Jan Sundquist, and Kristina Sundquist.
• Centre for Community-based Health Research and Education (COHRE), Organization for the Promotion of Project Research, Shimane University, Izumo, Japan.
• J. Neurol. Neurosurg. Psychiatr.. 2015 Mar 1;86(3):319-23.

Background/AimsDepression is associated with an increased risk for stroke. The aim of this study was to examine whether demographic and socioeconomic factors modify this association.MethodsThis follow-up study comprised 137 305 men and 188 924 women aged ≥30 years from a nationwide sample of primary healthcare centres in Sweden. We identified 4718 first-ever stroke cases (2217 men and 2501 women) during the follow-up period (2005-2007). Multilevel logistic regression models were used to calculate ORs and examine interactions in order to determine whether the association between depression and stroke differs by demographic or socioeconomic factors.ResultsDepression was associated with significantly greater odds of stroke after adjustment for potential confounding factors (OR=1.22, 95% CI 1.08 to 1.38). Interaction tests showed that the effect of depression on stroke was higher in men compared with women (the difference in OR between men and women was 1.30, 95% CI 1.01 to 1.68), that is, the association between depression and stroke was modified by gender.ConclusionsOur findings suggest that the depression-stroke association is modified by gender. Further studies are required to examine the underlying mechanisms in men and women.Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

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