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Table 1 Demographic data

From: Mortality prediction using SAPS II: an update for French intensive care units

Characteristics

All patients (n = 77,490)

Training set (n = 38,745)

Validation set (n = 38,745)

P

Age (years; mean ± standard deviation)

56.71 ± 18.91

56.70 ± 19.00

56.72 ± 18.83

0.9422

Age (%)

   <40 years

22.20

22.35

22.05

 

   40–59 years

27.95

27.77

28.13

 

   60–69 years

18.47

18.40

18.54

 

   70–79 years

21.68

21.65

21.71

 

   >79 years

9.69

9.82

9.57

 

Men (%)

59.31

59.06

59.56

0.1581

Medical patients (%)

73.49

73.46

73.53

0.8261

Patient origin (%)

    

   Emergency room or mobile emergency unit

49.94

49.75

50.13

0.1345

   Ward in same hospital

39.91

39.89

39.94

 

   Other hospital

10.15

10.36

9.93

 

Length of hospital stay before ICU admission (%)

   <24 hours

67.75

67.76

67.73

 

   1 day

12.37

12.56

12.18

 

   2 days

4.67

4.57

4.77

 

   3–9 days

9.5

9.59

9.42

 

   >9 days

5.71

5.52

5.9

 

Medicine overdose (%)

11.86

11.94

11.79

0.5122

Original SAPS II score

    

   Maximum

162.00

159.00

162.00

0.5817

   Median

32.00

32.00

32.00

 

   Minimum

1

1

1

 

ICU mortality (%)

17.99

17.95

18.03

0.7647

Hospital mortality (%)

21.48

21.39

21.58

0.5289

  1. P value obtained by the Wilcoxon test for quantitative variables and the χ2 test for qualitative variables. ICU, intensive care unit; SAPS, Simplified Acute Physiology Score.