Do you think severe headache with no known cause is a symptom of a stroke?

Response Unweighted Frequency Weighted Percentage Standard Error 95% Confidence Limit
Lower Upper
Yes 5672 64.4 0.9 62.7 66.1
No 1045 15.5 0.7 14.0 16.9
Dont know/Not sure 1680 20.1 0.7 18.8 21.5

Among all respondents, excluding refusals.
On Questionnaire Split A
ASKED ONLY TO LANDLINE SURVEY RESPONDENTS