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Figure 1 Relationship of race to severity of coronary artery disease. The distribution of the severity of coronary artery disease is significantly different between African Americans (AA) (solid bars) and whites (open bars), p = 0.01, by Mantel-Haenszel chi-square test for trend: Severe = left main or all three coronary artery systems with significant obstructions; Moderate = one or two systems with obstructions, including the proximal left anterior descending; Mild = one or two systems with obstructions, not including the proximal left anterior descending; None = no obstruction 70%.