Frequently Asked Questions
What is the difference between odds ratio and relative risk?
Relative risk compares probabilities directly and suits cohort studies, while the odds ratio uses the cross product of a table and suits case-control studies.
What does an odds ratio of one mean?
An odds ratio of one means there is no association between the exposure and the outcome. Values above one indicate increased odds of the outcome in the exposed group - for example, OR = 2.5 means the exposed group has 2.5 times the odds. Values below one indicate a protective association. The confidence interval matters as much as the point estimate: an OR of 3.0 with a 95% CI of 0.8–11 is not statistically significant at p < 0.05, while an OR of 1.4 with CI of 1.1–1.8 is.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.