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Kaplan–Meier curves illustrate the estimated survival probabilities for two distinct groups based on their serum NT-pro BNP levels. The demarcation is set at log10 = 4, which differentiates the high and very high groups. Abbreviations used: COPD denotes chronic obstructive pulmonary disease; DM signifies diabetes mellitus; MI stands for myocardial infarction; and CVA refers to cerebral vascular accident.
