Illustration of impact numbers estimated from a cohort study6
| Coronary heart disease | Lung cancer | |
|---|---|---|
| Annual death rate in smokers | 669/100000 | 140/100000 |
| Annual death rate in non-smokers | 413/100000 | 10/100000 |
| Relative risk, RR | 1.620 | 14.0 |
| Absolute risk difference, AR | 256/100000 | 130/100000 |
| Population attributable risk, PAR | 76.8/100000 | 39/100000 |
| Population attributable fraction, PAF | 0.157 | 0.796 |
| Aetiological fraction, AF | 0.383 | 0.929 |
| Exposed case impact number, ECIN | 2.61 | 1.08 |
| Case impact number, CIN | 6.38 | 1.26 |
| Exposure impact number, EIN | 391 | 769 |
| Population impact number, PIN | 1302 | 2564 |