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 2667 63.4 0.9 61.5 65.2
No 571 14.8 0.7 13.3 16.2
Don't know/not sure 904 21.8 0.8 20.3 23.4

Among all respondents, excluding unknowns and refusals.
 
On Questionnaire Split A