Effect of different aspirin regimens on serum TXB₂. The figure depicts individual data of serum TXB₂ levels measured in the different phases of the study, including baseline, washout, and randomized aspirin regimens. During washout, patients took enteric-coated aspirin 100 mg once daily. Horizontal lines indicate medians. Each symbol indicates 1 patient across different treatments. *P < .001 versus washouts and plain aspirin, and #P < .05 versus baseline, washout, and enteric-coated 100 mg twice daily. WO indicates washout; od, once daily; bid, twice daily; and EC, enteric-coated.