Table 2

Self-reported occupational exposure of men to asbestos and head and neck squamous cell carcinoma (HNSCC) by primary tumour site, for any occupational asbestos exposure and by duration spent at an asbestos-exposed occupation

	Primary tumour site
	Oral cavity		Pharynx		Larynx
Occupational asbestos exposure	n_cases/n_controls	OR* (95% CI)	n_cases/n_controls	OR* (95% CI)	n_cases/n_controls	OR* (95% CI)
Never occupationally exposed	168/654	Reference	233/654	Reference	83/654	Reference
Ever occupationally exposed	55/203	0.86 (0.59 to 1.24)	100/203	1.41 (1.01 to 1.97)	35/203	1.04 (0.64 to 1.67)
Per decade of exposure	52/202	0.92 (0.80 to 1.05)	98/202	1.10 (0.99 to 1.23)	33/202	1.07 (0.93 to 1.24)

*Adjusted for age, race, smoking, alcohol consumption, education, income and HPV16 serology.
Significant values are presented in bold type.