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Figure 1 Platelet aggregation induced by (A) collagen, 2 µg/ml and (B) adenosine diphosphate (ADP), 3.2 µmol/l. Results are expressed as the maximal percent change in light transmittance from baseline at 5 min after addition of the agonist using platelet-poor plasma as a reference. Box and whisker plots show median value (horizontal lines), 25th and 75th percentiles (boxes), and 90th percentiles (error bars). *p < 0.01, **p < 0.001.