STS Hospital-level stroke surveillance in Chilumba, Malawi: providing tools for evaluating interventions in hypertension and stroke in sub-Saharan Africa Karonga
If Q 3.4 (numsymp); If Q 3.3(firstsymp); Was this the first time you've had these symptoms?=no, how many times have you had these symptoms?= Once or Twice or More than twice, when was the most recent previous event?