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Figure 2 Box plots with the 10th, 25th, 50th, 75th and 90th percentiles. The serum Lp(a) level was significantly higher in patients with than in those without a history of previous myocardial infarction among the Spasm group. Spasm = patients with coronary spasm but without a significant fixed coronary stenosis. MI = previous myocardial infarction; m = median.