Kaplan–Meier survival curves according to serum sodium concentration.

<p>The serum sodium level affects mainly the 3-year mortality rate of patients. The 3-year cumulative survival rates for patients with moderate/severe and mild hyponatremia were 47.8%±8.5% and 59.8%±5.0%, respectively, and 78.2%±3.8% for normonatremic patients (Log-Rank, <i>P</i><0.001).