Table 5.

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.