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Kaplan–Meier plots for survival rates in the 5 groups during the 2-year follow-up period: univariate analysis. Categories: 1, SNa ≤ 136 mEq/l; 2, 136 < SNa ≤ 138 mEq/l; 3, 138 < SNa ≤ 140 mEq/l; 4, 140 < SNa ≤ 141 mEq/l; 5, 141 mEq/l < SNa.
