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Table 1 Patient Characteristics for Each Serum Sodium Concentration at Admission Groups

From: Association between borderline dysnatremia and mortality insight into a new data mining approach

Characteristic Hyponatremia Normal sodium level Hypernatremia P Value
Serum Sodium Levela, mmol/L <125
(n = 367)
[125;130)
(n = 1053)
[130;135)
(n = 5045)
[135;145]
(n = 38,869)
(145;150]
(n = 386)
(150;155]
(n = 58)
>155
(n = 51)
 
Age, mean ± SD, years 71 ± 15 68 ± 16 66 ± 18 60 ± 18 66 ± 20 70 ± 20 73 ± 20 < .001
Males, n (%) 195 (53.1) 544 (51.6) 2916 (57.8) 23,197 (59.7) 244 (63.2) 32 (55.2) 26 (51.0) < .001
ICU stay, n (%) 119 (32.4) 295 (28.0) 1191 (23.6) 7531 (19.4) 177 (45.9) 32 (55.2) 20 (39.2) < .001
Palliative care, n (%) 11 (3.0) 45 (4.3) 151 (3.0) 296 (0.8) 14 (3.6) 1 (1.7) 4 (7.8) < .001
Dialysis, n (%) 52 (14.2) 140 (13.3) 403 (8.0) 1322 (3.4) 48 (12.4) 6 (10.3) 6 (11.8) < .001
Dementia, n (%) 14 (3.8) 32 (3.0) 131 (2.6) 640 (1.6) 7.3 8.6 17.6 < .001
Hospital admissions via the emergency department, n (%) 123 (33.5) 306 (29.1) 886 (17.6) 4091 (10.5) 95 (24.6) 22 (37.9) 25 (49.0) < .001
Surgery, n (%) 64 (17.4) 241 (22.9) 1313 (26) 14,329 (36.9) 124 (32.1) 16 (27.6) 5 (9.8) < .001
Number of diagnosis codes, median (IQR) 7 (4–11) 6 (4–10) 6 (3–9) 4 (2–6) 6 (4–10) 6 (3–10) 6 (4–10) < .001
Length of stay (days), median (IQR) 10 (5–18) 10 (6–19) 8 (4–16) 5 (2–10) 9 (4–21) 10 (4.25–18.75) 10 (5–20.5) < .001
Charlson Comorbidity Index
median (IQR)
2 (1–5) 3 (1–5) 2 (1–4) 1 (0–2) 2 (0.25–3) 2 (0.25–3.75) 2 (1–3) < .001
Observed hospital mortality, n (%) 69 (18.8) 145 (13.7) 452 (9.0) 1066 (2.7) 80 (20.7) 14 (24.1) 12 (23.5) < .001
  1. Abbreviations: SD Standard deviation, IQR Interquartile range, ICU Intensive care unit
  2. aFirst serum sodium concentration determined the day of admission
  3. bPatients admitted to the Hôpital Européen Georges Pompidou between January 1, 2008 and June 31, 2014, with at least one serum sodium concentration determined the day of admission and for hospital stays of more than two days