Odds Ratio Calculator
2×2 contingency table: a=exposed/case, b=exposed/control, c=unexposed/case, d=unexposed/control
a (exposed, case)
b (exposed, control)
c (unexposed, case)
d (unexposed, control)
✓Odds Ratio
Odds Ratio
3.0000
ln(OR)
1.0986
95% CI
[2.044, 4.403]
OR = 1: no association | OR >1: positive association | OR <1: negative association
The odds ratio (OR) measures the association between an exposure and an outcome in case-control studies. An OR > 1 indicates increased risk; OR < 1 indicates reduced risk; OR = 1 indicates no association.
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