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Figure 4 Median post-stress test B-type natriuretic peptide (BNP) levels with interquartile ranges in patients with none, mild-to-moderate, and severe ischemia, stratified into those with ejection fractions  50% (black bars) and <50% (white bars). Numbers within each bar represent the number of patients in that group. The p values are for trend across ischemic categories (p = 0.14 for patients with ejection fraction <0.5; p = 0.012 for patients with ejection fraction 0.5.). ETT = exercise tolerance test; Mod = moderate.
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