Smoking | ||||
---|---|---|---|---|
Never | Ever | |||
Cohort affiliation | Incidence (/1000) | IRR* (95% CI) | Incidence (/1000) | IRR* (95% CI) |
*IRRs are adjusted for calendar year (1970–80, 1981–90, and 1991–96), hay fever (no/yes), and region (south/middle-north). | ||||
Referents | 2.5 | 1.0 (–) | 3.7 | 1.6 (1.2 to 2.2) |
Hairdressers | 4.4 | 1.6 (1.1 to 2.2) | 3.4 | 1.5 (1.0 to 2.1) |