Relative risk
Risk of a binary outcome in one group divided by the risk in another.
When to use it
Use relative risk when you have a 2×2 table and you want a ratio of probabilities, not odds. The first alphabetical outcome level is the event. The first group level is the exposed group.
Assumptions
Both columns have exactly two levels. Relative risk is easiest to interpret when the rows are groups and the columns are the outcome of a cohort, not a case-control sample.
Running it in Tensr
risk_exposed.Options
Prop
Type
Reading the output
The same weak 2×2, as a ratio of risks rather than odds.
| exposed | No | Yes |
|---|---|---|
| No | 28 | 15 |
| Yes | 23 | 24 |
Relative risk of case by exposed, n = 90. The primary result is not significant (p = .140). This is not large enough to treat the comparison this page is about as a reliable association. The result is non-significant: the data are still compatible with no effect. Metrics: Relative risk = 1.331; 95% CI = [0.924, 1.917]; p-value = .140; Risk (exposed) = 0.651; Risk (unexposed) = 0.489.
Reporting (APA 7)
Relative risk of case by exposed, n = 90. This result is not significant (p = .140). Report the estimate with that p, and do not describe the pattern as a reliable effect.
Coming from SPSS
Analyze → Descriptive Statistics → Relative Risk. Confirm which row SPSS calls exposed.