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Figure 2 Comparison of calibrated integrated backscatter (IBS) values between patients with stable coronary artery disease (CAD) and patients with acute coronary syndrome (ACS). The dotted line indicates the cut-off level for echolucent plaque (–13.4 dB, which represents the 75th percentile of the distribution in patients with ACS). Box and whisker plot: lines within boxes represent median values; upper and lower lines of boxes represent 25th and 75th percentiles, respectively; and upper and lower bars outside of boxes represent 90th and 10th percentiles, respectively.
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