The study looked at 784 couples, examining common shared factors.
Beside physical activity, they looked at shared histories of head injury, sleep problems, social isolation and depressive disorders.
The environment they live in may influence their exposure to second hand smoke and other risk factors.
Beginning in November of 2010 the study followed the 784 couples for a decade, checking in at two year intervals.
The study was published in Jama Network Open.
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The study looked at 784 couples, examining common shared factors.
Beside physical activity, they looked at shared histories of head injury, sleep problems, social isolation and depressive disorders.
The environment they live in may influence their exposure to second hand smoke and other risk factors.
Beginning in November of 2010 the study followed the 784 couples for a decade, checking in at two year intervals.
The study was published in [Jama Network Open](https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2787259).