Table 2.

Stroke Incidence by Exposure to Secondhand Smoke

	No. of Events	Cumulative Person-Years	Event Rate/1,000 Person- Years (95% CI)
Any stroke a	428	121,231	3.53 (3.20, 3.87)
SHS exposure	111	28,359	3.91 (3.22, 4.68)
No SHS exposure	317	92,872	3.41 (3.05, 3.80)
Ischemic stroke	352	121,231	2.90 (2.61, 3.21)
SHS exposure	90	28,359	3.17 (2.55, 3.86)
No SHS exposure	262	92,872	2.82 (2.49, 3.17)
Hemorrhagic stroke	50	121,231	0.41 (0.31, 0.53)
SHS exposure	12	28,359	0.42 (0.29, 0.55)
No SHS exposure	38	92,872	0.41 (0.29, 0.55)

SHS, secondhand smoke

^aTwenty-six strokes were of unknown subtype.