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Figure 4 Incidence of acute coronary syndrome (ACS) events. The incidence of ACS events was estimated with the Kaplan-Meier method. Patients with multiple yellow plaques (number of yellow plaques [NYP] 2) had a significantly higher incidence (p = 0.02 by log rank test) of ACS events compared with those with fewer yellow plaques (NYP 0 or 1).