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Sodium level - influence of illness severity and Charlson Comorbidity Index score. Illness severity and Charlson Comorbidity Index score (CCI) are both independent predictors of sodium level (Open circles - CCI 0-2; Closed circles - CCI 3-4; Closed squares - CCI 5 or higher). P values significant (< 0.01) for all. CCI: Charlson Comorbidity Index.
