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Figure 7 Kaplan-Meier event-free survival curves for death or heart failure admission for those with brain natriuretic peptide (BNP) (solid lines) and amino terminal pro-brain natriuretic peptide (NTproBNP) (dotted lines) above (lower two lines) or below (upper two lines) the median level for the group. For both peptides, the separation of survival curves was highly significant (p < 0.001). CHF = congestive heart failure.