Scatter plots of reproducibility data at submaximal agonist concentrations. For each assay depicted, the extent of aggregation (y-axis) exhibited during each of the 27 subjects' 4 assay runs is shown. Subject numbering (x-axis) in each panel is ordered from the lowest to highest mean percent aggregation for that particular assay and does not correspond with numbering in other panels. The appearance of fewer than 4 data points is due to superimposed values. Dashed lines represent cutoffs for classifying relative platelet hyperreactivity for each assay.