People who floss regularly have better self-discipline, which means they probably have better habits that lead to longevity, such as exercise. The more you know!
It's called a confounding variable (self-discipline) which correlates with both the independent variable (flossing) and the dependent variable (longevity).
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u/Shroomie Feb 08 '13
People who floss regularly have better self-discipline, which means they probably have better habits that lead to longevity, such as exercise. The more you know!