Epiville

Interactive

Confounding Visual Exercise 5 -- Low-birth Weight

Does drinking coffee have an effect on low-birth weight?

Restricted to the smoking study participants, does drinking coffee have an effect on low birth weight?

Smokers

Cases Controls

2×2 Table

Cases Controls
Coffee 20 8
No Coffee 5 2

Odds Ratio = 1.0

After stratifying the data on smoking and looking separately at smokers and non-smokers, it is evident that there is no effect of drinking on LBW.