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Findings from a hypothetical cohort study of 20,000 persons followed for 10 years.
| Exposed | Nonexposed | Ratio | |
|---|---|---|---|
| Cases | 1,813 (a) | 952 (b) | |
| Noncases | 8,187 (c) | 9,048 (d) | |
| Total population | 10,000 (N1) | 10,000 (N0) | |
| Person-years | 90,635 (Y1) | 95,163 (Y0) | |
| Incidence rate | 0.0200 (I1) | 0.0100 (I0) | 2.00 |
| Incidence proportion (average risk) | 0.1813 (R1) | 0.0952 (R0) | 1.90 |
| Incidence odds | 0.2214 (O1) | 0.1052 (O0) | 2.11 |
