Impact numbers for stroke in a case-control study7
| Past medical history of atrial fibrillation | Cigarette smoking (20+ per day) | |
|---|---|---|
| *Derived from adjusted OR in study7; †estimated as incidence in the total population, as the risk factor is relatively uncommon. | ||
| Proportion controls exposed, Pe | 0.022 | 0.061 |
| Odds ratio, OR* | 5.4 | 2.9 |
| Annual incidence in unexposed group†, Iu | 68.67/100000 | 68.67/100000 |
| Case impact number, CIN | 11.33 | 9.63 |
| Population impact number, PIN | 15044 | 12565 |
| Exposed case impact number, ECIN | 1.23 | 1.53 |
| Exposure impact number, EIN | 331 | 767 |