This month has seen the publication of an interesting ‘cohort study’ about the economics of smoking.
But first a little about cohort studies:
A cohort study means researchers can use big sample sizes, in this case 1976 smoking men from the ages of 54-60yrs, and then study them for a really long time – 27 years in this instance.
Using cohort research methodology the researchers can demonstrate the sequence between exposure and outcome that often takes a while to show, and what these
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