New views on the hypothesis of respiratory cancer risk from soluble nickel exposure; and reconsideration of this risk's historical sources in nickel refineries

Table 4 Risk of respiratory cancer mortality in Pedersen et al. (1973) [1]; and respiratory cancer incidence in Magnus et al. (1982) [2]

	Nasal cavities		Larynx		Lung		All respiratory organs
Categories of work	Obs	SMR	Obs	SMR	Obs	SMR	Obs	SMR
	Pedersen *et al* . (1973)
Roasting-smelting	5	5000	4	1000	12	480	21	700
Electrolysis	6	3000	-	-	26	720	32	744
Other specified processes	1	1000	1	500	6	460	8	500
Administration, service and unspecified	2	2000	-	-	4	150	6	194
Total	14	2800	5	360	48	475	67	558
	Magnus *et al* . (1982)
Roasting-smelting	8	4000	4	670	19	360	31	510
Electrolysis	8	2670	0	0	40	550	48	570
Other specified processes	2	2000	1	330	12	390	15	430
Administration, service and unspecified	3	1500	0	0	11	175	14	190
Total	21	2630	5	210	82	370	108	430