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 15 Comparison of record linkage and independent follow-up in Roberts et al. (1989)* [9, 10]

Based on record linkage	Based on independent follow-up
	Dead	Alive	Totals
Dead	58 (92.10%)	0 (0.00%)	58
Alive	5 (7.90%)	862 (100.00%)	867
Totals	63 (100.00%)	862 (100.00%)	925**

* Table two in Ref. [10]. ** 75 cases excluded: 31 not traced, 44 left country (of whom 13 known alive; 4 known dead).

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