Degree of divergence between odds ratios (ORs) and relative risks (RRs)*
| Relative risk | ||||
|---|---|---|---|---|
| Baseline risk | 0.5 | 0.75 | 2 | 4 |
| *NA = not available (ie, not calculable). | ||||
| The table lists the ORs corresponding to various RRs and baseline risks. Notice that as the baseline risk increases, and as the RR is further from 1, the degree of divergence between the OR and the RR increases. Regardless of the magnitude of the RR, the OR is always further from 1 than the RR. | ||||
| 5% | 0.49 | 0.74 | 2.11 | 4.75 |
| 10% | 0.47 | 0.73 | 2.25 | 6.0 |
| 20% | 0.44 | 0.70 | 2.67 | 16.0 |
| 50% | 0.33 | 0.60 | NA | NA |
| 70% | 0.23 | 0.47 | NA | NA |