Table 1 Effect sizes that minimally can be detected according to the prevalence of the exposure in the final cohort of 2001 travellers
| Proportion exposed (%) | Odds ratio |
|---|---|
| 50% | 1.36 |
| 25% | 1.41 |
| 10% | 1.64 |
| 5% | 1.92 |
| Proportion exposed (%) | Odds ratio |
|---|---|
| 50% | 1.36 |
| 25% | 1.41 |
| 10% | 1.64 |
| 5% | 1.92 |