I don't understand how large observational cohorts get published without either attempting to control for social factors or at least addressing why that might not be necessary
Totally fine that they didn't control for everything - you can never have ALL the information - but there's no control for ethnicity, only a very meagre control for income, and none for education either That may not be a problem, but it should be addressed!
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As it is, I'd have to say that the observed association between stroke and working hours is just as likely to be a result of any number of unmeasured confounders as a causal relationship
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In other words, I'm not convinced that working too many hours will give you a stroke, outside of the societal pressures that force people to work 50+ hour weeks in the first place
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