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.