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Figure 3 Unadjusted risk ratios for quartiles (Q) of osteoprotegerin at baseline in relation to incidence of angina, nonfatal myocardial infarction (MI), cardiac death, total mortality, or the composite end point (all-cause mortality, stroke, and nonfatal MI). *p < 0.05; p < 0.01; p < 0.001 vs. Q1.