Confounding Visual Exercise 1 -- Low-birth Weight
Does drinking coffee have an effect on low-birth weight?
| Cases | Controls |
|---|---|
|
|
2×2 Table
| Cases | Controls | |
|---|---|---|
| Coffee | 21 | 12 |
| No Coffee | 9 | 18 |
Odds Ratio = 3.5
It appears that there is a strong effect of drinking coffee on low birth weight.
