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Figure 1 Quartile analysis of a lipid oxidation marker (malondialdehyde measured as thiobarbituric acid reactive substances) in patients with documented coronary artery disease. CABG = coronary artery bypass grafting; CHF = congestive heart failure; MI = myocardial infarction; PTCA = percutaneous transluminal coronary angioplasty; RR = relative risk.