More recently, ATT Collaboration conducted another meta-analysis involving 16 secondary prevention trials (17 000 individuals at high average risk, 43 000 person-years, 3306 serious vascular events) that compared long-term aspirin versus control. This analysis showed that aspirin allocation yielded a greater absolute reduction in serious vascular events (6.7% versus 8.2% per year, P < 0.0001), with a nonsignificant increase in haemorrhagic stroke but reductions of about 20% in total stroke (2.08% versus 2.54% per year, P = 0.002) and in coronary events (4.3% versus 5.3% per year, P < 0.0001)
More recently, ATT Collaboration conducted another meta-analysis involving 16 secondary prevention trials (17 000 individuals at high average risk, 43 000 person-years, 3306 serious vascular events) that compared long-term aspirin versus control. This analysis showed that aspirin allocation yielded a greater absolute reduction in serious vascular events (6.7% versus 8.2% per year, P < 0.0001), with a nonsignificant increase in haemorrhagic stroke but reductions of about 20% in total stroke (2.08% versus 2.54% per year, P = 0.002) and in coronary events (4.3% versus 5.3% per year, P < 0.0001)
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