Adjusted incidence rate of hospitalisations for respiratory tract infection according to smoking status
| Smoking status | Age-adjusted and sex-adjusted rate per 1000 pyr (95% CI) | Attributable risk per 1000 pyr (95% CI) |
| First RTI hospitalisation | ||
| All | 22.8 (21 to 24.7) | – |
| Never | 14.2 (11.8 to 16.6) | Ref |
| Former | 27.7 (24.4 to 30.9) | 13.5 (11.6 to 15.3) |
| Current | 27.8 (22.3 to 33.2) | 13.6 (11.7 to 15.5) |
| All RTI hospitalisations | ||
| All | 32.2 (30 to 34.3) | – |
| Never | 17.3 (14.7 to 20) | Ref |
| Former | 43 (39.1 to 46.8) | 25.6 (23.4 to 27.9) |
| Current | 36.3 (30.3 to 42.2) | 18.9 (16.8 to 21.1) |
Table shows incidence rates for the first RTI hospitalisations during follow-up and episode rates for all RTI hospitalisations during follow-up.
pyr, person-years; ref, reference; CI, confidence interval; RTI, respiratory tract infection; Ref, reference.