Change of discriminative predictors values over time from admission to discharge within each patient risk group. (a) Average value of last three hemoglobin measurements (gm/dL). (b) Average value of last three sodium measurements (mmol/L). (c) Decrease of potassium level from admission (mmol/L). (d) Normalized time of minimal potassium starting from admission. (e) Decrease of diastolic blood pressure level from admission (mmHg).