1Among the 709 enrolled subjects, 6 were excluded from the analysis (3 subjects had no controls identified; 2 subjects completed interviews more than 30 days after their stroke event; and the index date for 1 subject could not be determined).
2Missing or uncertain responses: Education (2 cases), hypertension (1 control), diabetes (5 cases and 2 controls), primary family history (137 cases and 246 controls), body mass index (5 cases and 4 controls), URI symptoms (39 cases and 54 controls).
3Current use (defined as use on ID or preceding day).
