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Survival curves stratified for ID after adjustment for the covariates that are significant in the multivariate model: Age, sex, diabetes mellitus, New York Heart Association class III-IV, haemoglobin, logarithmic transformation of N-terminal pro-brain natriuretic peptide, serum sodium, and treatment with an angiotensin converting enzyme inhibitor or angiotensin II receptor blocker, beta blockers and diuretics
