Table 3.

Lung Cancer Relative Risks (OR) and 95% CI in Relation to Ever and Duration of Employment as Firefighter

Variable	Exposure category	Cases	Controls	OR1	95% CI	OR2	95% CI	OR3	95% CI
Firefighter	Never	14,662	17,439	1.0	Reference	1.0	Reference	1.0	Reference
	Ever	86	104	1.03	0.77–1.38	0.95	0.68–1.32	0.95	0.68–1.32
Duration	<6	32	24	1.56	0.91–2.67	1.19	0.65–2.15	1.21	0.67–2.19
firefighter	6–21	22	26	1.13	0.64–2.00	0.99	0.52–1.86	0.97	0.51–1.84
(years)	22–32	14	26	0.69	0.36–1.33	0.70	0.32–1.50	0.69	0.32–1.49
	33+	18	28	0.84	0.46–1.53	0.91	0.47–1.77	0.92	0.48–1.78
	p-value trend			0.46		0.58		0.58

OR1 is adjusted for study and age

OR2 is in addition adjusted for cumulative cigarette smoking (pack-years) and time since quitting smoking

OR3 is in addition adjusted for ever employment in a List A job (ever/never)