Intro to Stats: Videos & Practice Problems

A research team enrolled $2000$ adults in $1995$ and collected baseline information on their habitual coffee consumption using questionnaires. The investigators classified participants as drinking at least $2$ cups per day or fewer than $2$ cups per day, then reassessed blood pressure and the occurrence of hypertension every $3$ years until $2015$. They compared the incidence of new hypertension between the two consumption groups. Why is this a cohort study?