Assertion: tia's risk | /r/HasProperty | less than half
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Source sentences:
text: The risk of recurrent stroke at 2 days, 7 days, 30 days, 90 days, and 1 year was less than half that expected from historical cohorts; for example, the risk of stroke and other vascular events at 90 days in the historical cohorts was 12 to 20%,3,4 as compared with 3.7% in our cohort.