Comparison of baseline characteristics of patients receiving low-dose aspirin and patients receiving high- dose aspirin*.

*Plus–minus values are means ±SD. Baseline characteristics of the two groups were compared with the use of either an independent groups t-test (for means) or a chi-square test (for percentages). TIA denotes transient ischaemic attack; BA denotes basilar artery; MCA denotes middle cerebral artery.