Skip to main content

Table 2 Risk of In-Hospital Mortality According to Patient and Stay Characteristics

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

Characteristic OR (95%CI) P Value
Serum sodium concentration, mmol/L
  < 125 7.95 (5.91–10.53) <.001
 [125;130) 5.59 (4.62–6.72) <.001
 [130;135) 3.58 <.001
 [135;145] 1 [Reference]  
 (145;150] 9.19 (7.06–11.83) <.001
 (150;155] 10.16 (5.10–18.74) <.001
Age, years
  < 30 1 [Reference] NA
 [30;40) 0.66 (0.45–0.97) .0381
 [40;50) 1.02 (0.74–1.40) .9256
 [50;60) 1.94 (1.49–2.56) <.001
 [60;70) 1.83 (1.42–2.41) <.001
 [70;80) 2.43 (1.88–3.18) <.001
 [80;90) 4.00 (3.11–5.24) <.001
  ≥ 90 6.41 (4.80–8.66) <.001
Sex
 F 1 [Reference] NA
 M 1.20 (1.09–1.32) <.001
Duration of hospital stay, days
  ≤ 7 1 [Reference] NA
 (7;14] 1.59 (1.41–1.80) <.001
 (14;21] 2.55 (2.19–2.97) <.001
 (21;42] 4.04 (3.50–4.66) <.001
  > 42 5.81 (4.80–6.98) <.001
Number of ICD-10 codes
  ≤ 1 1 [Reference] NA
 (1;4] 1.39 (1.08–1.80) .0112
 (4;7] 3.96 (3.13–5.08) <.001
 (7;10] 7.34 (5.78–9.44) <.001
 (10;15] 10.61 (8.32–13.69) <.001
 (15;20] 18.31 (13.84–24.40) <.001
  > 20 31.77 (23.50–43.20) <.001
Hospital admissions via the emergency department 2.29 (2.04–2.56) <.001
Any surgery 1.04 (0.94–1.15) .402
ICU stay 11.85 (10.29–12.69) <.001
Palliative care 12.75 (10.54–15.38) <.001
Dialysis 15.49 (13.86–17.30) <.001
Dementia 2.67 (2.11–3.34) <.001
Charlson Comorbidity Index
 0 1 [Reference] NA
 1 2.72 (2.21–3.36) <.001
 2 4.56 (3.76–5.54) <.001
 3–4 7.59 (6.31–9.17) <.001
 5–9 12.12 (10.11–14.62) <.001
  ≥ 10 19.86 (15.31–25.72) <.001
  1. Abbreviations: OR Odds ratio, CI Confidence interval, ICU Intensive care unit, ICD International Statistical Classification of Diseases and Related Health Problems