Is outdoor work associated with elevated rates of cerebrovascular disease mortality? A cohort study based on iron-ore mining

Table 2 Adjusted rate ratio estimates derived from Poisson regression models, with 95 % confidence intervals (CI)

	0–4 years		5–14 years			15–24 years			≥25 years
	n^a	Rate ratio	n^a	Rate ratio	95 % CI	n^a	Rate ratio	95 % CI	n^a	Rate ratio	95 % CI	Test of trend, p-value
Cerebrovascular diseases	228	1	77	1.22	0.90–1.62	50	1.42	0.97–2.04	48	1.62	1.07–2.42	0.010
Cerebrovascular diseases limited to age ≥ 55	195	1	73	1.26	0.91–1.71	49	1.45	0.97–2.13	47	1.62	1.04–2.47	0.013
Cerebrovascular diseases adjusted for acute effects^b	228	1	77	1.22	0.91–1.62	50	1.42	0.98–2.04	48	1.63	1.08–2.41	0.008

^aNumber of deaths. ^bEstimated from Poisson model, included a variable coded 1 if employed and 0 otherwise to control for death occurring while employed

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