Table 3. Case Numbers and SIRs of Firefighters Compared to All Public Officers or General and Education Officers.

Disease	Firefighters Identified cases	Comparison to all public officers		Comparison to general and education officers
		Expected cases	SIR (95% CI)	Expected cases	SIR (95% CI)
Overall	639	525	1.22 (1.12–1.31)	424	1.51 (1.39–1.63)
Myocardial infarction	88	57	1.54 (1.23–1.90)	43	2.07 (1.66–2.55)
Stroke of any type	160	136	1.18 (1.01–1.38)	114	1.40 (1.19–1.63)
Cardiac arrhythmia	135	89	1.52 (1.27–1.80)	70	1.93 (1.61–2.28)

SIR, standardized incidence ratio; CI, confidence interval.