Table 1.

Standardized cancer mortality and cancer incidence ratios (SMR and SIR) in a cohort of workers of a secondary aluminium smelter from 1961 to 2011

		Observed	Expected	SMR/SIRb	95% CI
Cancer mortality	All cancersa	16	11.34	1.41	0.80, 2.28
	Lung cancer	3	3.09	0.97	0.19, 2.83
	Bladder cancer	4	0.67	5.90*	1.58, 15.11
Cancer incidence	All cancers	26	21.22	1.22	0.80, 1.79
	Lung cancer	3	3.8	0.77	0.15, 2.26
	Bladder cancer	8	2.8	2.85*	1.23, 5.62
	Prostate cancer	6	2.96	2.02	0.74, 4.41

^aComparing to cancer mortality and incidence rates of the population of Tarragona province.

^bMortality from all cancers did not increase with duration of exposure.

*P < 0.05.