Table 2

IRR of stroke by age groups

Age groups	1994–2002 vs 1985–1993			2003–2011 vs 1994–2002			2003–2011 vs 1985–1993
Age groups	IRR (95% CI)		p Value	IRR (95% CI)		p Value	IRR (95% CI)		p Value
<55 years	1.091	(0.851 to 1.401)	0.491	1.597	(1.282 to 1.988)	<0.001	1.743	(1.389 to 2.188)	<0.001
55–64 years	1.276	(1.014 to 1.605)	0.037	0.883	(0.713 to 1.093)	0.252	1.126	(0.900 to 1.408)	0.298
65–74 years	1.099	(0.937 to 1.289)	0.245	1.039	(0.888 to 1.214)	0.634	1.141	(0.972 to 1.340)	0.107
75–84 years	0.947	(0.837 to 1.071)	0.386	1.106	(0.983 to 1.244)	0.094	1.047	(0.931 to 1.177)	0.441
85+ years	1.033	(0.879 to 1.213)	0.696	1.067	(0.927 to 1.229)	0.363	1.102	(0.944 to 1.287)	0.219

IRR; Incidence rate ratio.