Incidence rate and relative risks, 95% confidence intervals of events associated with anticoagulant and antiplatelet within different risk strata.

Abbreviations: CI, confidence interval; RR, relative risk.
*Incidence rate/1000 person-years
The detailed breakdown by actual therapy shown in Fig 2 shows that compared to warfarin (reference), aspirin was associated with less bleeding. However, bleeding risk was not significantly different for other categories of drug exposures.
Incidence rate and relative risks, 95% confidence intervals of events associated with anticoagulant and antiplatelet within different risk strata.