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

Response Unweighted Frequency Weighted Percentage Standard Error Lower 95% Confidence
Limit
Upper 95% Confidence
Limit
Yes 2599 60.8 1.0 58.9 62.7
No 605 15.3 0.7 13.9 16.7
Don't know/not sure 982 23.9 0.9 22.2 25.6

Among all respondents, excluding refusals.
 
On Questionnaire Split B