| Analytical parameter | Mean (SD) | ||
| Admission | Hospitalization | Discharge | |
| [Na+]P (mmol/L) | 123.44 (6.51) | 128.32 (5.55) | 132.46 (6.98) |
| [Na+]O (mmol/L) | 49.44 (36.05) | 61.17 (45.10) | 65.14 (33.85) |
| [K+]O (mmol/L) | 46.22 (26.35) | 25.50 (16.33) | 21.68 (8.21) |
| OsmP (mOsm/Kg) | 264 (23.40) | 267.25 (16.45) | 274.11 (11.01) |
| OsmO (mOsm/Kg) | 440.83 (122.14) | 354.29 (167.50) | 328.85 (156.43) |