The increased risk of suicide within families of suicide decedents is primarly explained by a shared genetic etiology, but shared environment factors also play a role

Perhaps not that surprising considering all the other behavioral genetics findings. However there are few concordant pairs (both completed suicide) in some groups despite a population-based design in Sweden.

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References §

• Tidemalm2011 - Familial clustering of suicide risk, A total population study of 11,4 million individuals