Incidence of sporadic cases of community acquired legionnaires’ disease and industrial exposure (relative risks with 95% confidence intervals obtained from multivariate Poisson regression model)
| Variable | RR (95% cI) | p |
|---|---|---|
| Plume of smoke | 1.45 (1.12 to 1.87) | <0.01 |
| Number of aerosols | – | 0.07 |
| 0 | 1.0 (ref) | |
| 1 | 1.06 (0.81 to 1.38) | 0.68 |
| ⩾2 | 1.37 (1.04 to 1.79) | 0.02 |
| Latitude | 1.37 (1.18 to 1.58) | <0.01 |
| Longitude | 1.42 (1.25 to 1.61) | <0.01 |
| Latitude × longitude | 0.97 (0.95 to 0.99) | <0.01 |