Table 2.
Demographic and clinical characteristics of hospitalizations according to categories of sodium levels.
| All | Normal | Mild | Moderate | Severe | p value | |
|---|---|---|---|---|---|---|
| N | 6,539 | 4,416 | 1,467 | 428 | 228 | |
| Women (%) | 2,794 (42.7) | 1,925 (43.6) | 564 (38.5) | 187 (43.7) | 118 (51.8) | <0.001 |
| Age groups (%) | <0.001 | |||||
| <60 | 1,561 (23.9) | 1,036 (23.5) | 378 (25.8) | 104 (24.3) | 43 (18.9) | |
| 60–69 | 1,340 (20.5) | 817 (18.5) | 343 (23.4) | 120 (28.0) | 60 (26.3) | |
| 70–79 | 1,597 (24.4) | 1,095 (24.8) | 352 (24.0) | 93 (21.7) | 57 (25.0) | |
| ≥80 | 2,041 (31.2) | 1,468 (33.2) | 394 (26.9) | 111 (25.9) | 68 (29.8) | |
| Main diagnosis on discharge (%) | <0.001 | |||||
| Pulmonary disease | 1,669 (25.5) | 1,228 (27.8) | 333 (22.7) | 79 (18.5) | 29 (12.7) | |
| Heart disease | 1,121 (17.1) | 826 (18.7) | 195 (13.3) | 56 (13.1) | 44 (19.3) | |
| Cancer | 537 (8.2) | 342 (7.7) | 138 (9.4) | 43 (10.1) | 14 (6.1) | |
| Neurological disease | 326 (5.0) | 234 (5.3) | 57 (3.9) | 22 (5.1) | 13 (5.7) | |
| Liver disease | 211 (3.2) | 86 (2.0) | 89 (6.1) | 22 (5.1) | 14 (6.1) | |
| Endocrine disorders | 139 (2.1) | 42 (1.0) | 46 (3.1) | 19 (4.4) | 32 (14.0) | |
| Psychiatric disorders | 85 (1.3) | 57 (1.3) | 18 (1.2) | 7 (1.6) | 3 (1.3) | |
| Other diseases | 2,451 (37.5) | 1,601 (36.3) | 591 (40.3) | 180 (42.1) | 79 (34.7) |
Hyponatremia values include acquired-hyponatremia and hospital-acquired hyponatremia: Lausanne University Hospital, 2012–2018.
Results are expressed as number of hospitalizations (percentage). Between-group comparisons performed using chi-square test.