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Table 3 The association between laboratory results and 90-day mortality in older patients visiting the ED

From: Prediction of 90-day mortality in older patients after discharge from an emergency department: a retrospective follow-up study

   Univariate Cox regression analysis
Eventsa (Total) HR (95 % CI) P-value
Haemoglobin
 Within reference range (male: 8.5-11.0 mmol/L, female: 7.5-10.0 mmol/L) 147 (1458) ref ref
 Below reference range 158 (965) 1.66 (1.33–2.08) <0.001
 Above reference range 5 (37) 1.39 (0.57–3.38) 0.472
 Not measured 37 (831) 0.43 (0.30–0.61) <0.001
Thrombocytes
 Within reference range (150-400*109/L) 188 (1402) ref ref
 Below reference range 46 (242) 1.45 (1.05–2.01) 0.023
 Above reference range 26 (71) 3.18 (2.11–4.80) <0.001
 Not measured 87 (1576) 0.39 (0.31–0.51) <0.001
Leukocytes
 Within reference range (4.00-10.00*109/L) 128 (1523) ref ref
 Below reference range 11 (65) 2.10 (1.14–3.89) 0.018
 Above reference range 171 (872) 2.50 (1.99–3.14) <0.001
 Not measured 37 (831) 0.52 (0.36–0.75) <0.001
C-reactive protein
 Within reference range (0.0–5.0 mg/L) 88 (1102) ref ref
 Above reference range 214 (1244) 2.25 (1.75–2.88) <0.001
 Not measured 45 (945) 0.58 (0.41–0.83) 0.003
Sodium
 Within reference range (136–144 mmol/L) 208 (1862) ref ref
 Below reference range 65 (391) 1.53 (1.16–2.02) 0.003
 Above reference range 37 (165) 2.14 (1.51–3.03) <0.001
 Not measured 37 (873) 0.36 (0.26–0.52) <0.001
Potassium
 Within reference range (3.6–4.8 mmol/L) 200 (1804) ref ref
 Below reference range 35 (162) 2.12 (1.48–3.03) <0.001
 Above reference range 58 (304) 1.78 (1.33–2.38) <0.001
 Not measured 54 (1021) 0.46 (0.34–0.63) <0.001
Creatinine
 Within reference range (64–104 μmol/L) 127 (1258) ref ref
 Below reference range 57 (475) 1.20 (0.88–1.64) 0.247
 Above reference range 124 (685) 1.87 (1.46–2.40) <0.001
 Not measured 39 (873) 0.43 (0.30–0.61) <0.001
Urea
 Within reference range (2.5–7.5 mmol/L) 95 (1199) ref ref
 Below reference range 1 (1) 20.72 (2.88–148.92) 0.003
 Above reference range 214 (1213) 2.34 (1.83–2.97) <0.001
 Not measured 37 (878) 0.52 (0.35–0.76) 0.001
Troponin T
 Within reference range (0.000–0.050 μg/L) 146 (1484) ref ref
 Above reference value 77 (268) 3.26 (2.47–4.30) <0.001
 Not measured 124 (1539) 0.80 (0.63–1.02) 0.066
Non-fasted glucose
 Within reference range (3.1–11.0 mmol/L) 249 (2123) ref ref
 Below reference range 2 (7) 2.83 (0.70–11.39) 0.143
 Above reference range 55 (253) 2.04 (1.52–2.73) <0.001
 Not measured 41 (908) 0.37 (0.27–0.52) <0.001
  1. Abbreviations: mmol millimol, L liter, mg milligram, HR hazard ratio, CI confidence interval
  2. Bold formatting has been used to mark statistical significant P-values
  3. a‘Events’ represent the number of deaths in each category within 90 days after ED admittance