Table 1 Baseline characteristics

Number of total admissions, n

55,083

8754

18,214

9,020

19,095

–

Number of observation sets, n

2,855,679

363,765

837,466

254,342

1,400,106

–

Age, y, mean ± SD

60.06 ± 15.95

60.77 ± 16.71

59.76 ± 16.01

62.58 ± 15.22

58.80 ± 15.73

 < 0.001

Length of stay, mean ± SD

5.81 ± 11.53

7.02 ± 21.39

4.70 ± 5.61

8.61 ± 14.30

5.00 ± 6.40

 < 0.001

Male, sex, n (%)

26,980 (48.98%)

4,448 (50.81%)

8,751 (48.04%)

4,907 (54.40%)

8,874 (46.47%)

 < 0.001

Variables within 24 h before outcome (IHCA or UIT) patients, mean ± SD

 SBP (mmHg)

116.17 ± 28.82

117.40 ± 29.89

115.25 ± 27.73

114.19 ± 24.26

117.14 ± 31.54

 < 0.05

 DBP (mmHg)

68.16 ± 17.02

68.07 ± 17.06

66.90 ± 17.14

69.80 ± 15.38

69.60 ± 17.57

 < 0.001

 HR (/min)

98.62 ± 23.64

96.93 ± 24.43

98.99 ± 22.46

101.48 ± 25.16

98.83 ± 24.07

 < 0.001

 RR (/min)

21.69 ± 6.60

20.97 ± 4.81

21.59 ± 7.90

22.61 ± 5.16

22.63 ± 6.67

 < 0.001

 BT (°C)

37.03 ± 0.95

37.11 ± 1.11

36.97 ± 0.85

36.82 ± 0.63

37.18 ± 0.96

 < 0.001

 SpO2 (%)

95.72 ± 4.61

96.10 ± 4.65

95.40 ± 4.43

95.44 ± 5.14

96.17 ± 4.63

 < 0.001

 Lactic acid (mmol/L)

4.05 ± 3.79

4.44 ± 4.46

3.60 ± 2.45

3.62 ± 3.41

3.81 ± 3.00

0.39

 pH

7.37 ± 0.12

7.38 ± 0.11

7.37 ± 0.10

7.38 ± 0.13

7.34 ± 0.13

 < 0.05

 PaCO2 (mmHg)

39.04 ± 15.43

40.26 ± 13.80

40.27 ± 23.99

37.42 ± 12.87

41.06 ± 14.92

0.15

 PaO2 (mmHg)

106.61 ± 64.52

113.22 ± 80.55

104.33 ± 55.00

107.47 ± 56.74

91.83 ± 52.71

0.08

 TCO2 (mEq/L)

21.85 ± 5.76

20.38 ± 4.40

22.19 ± 5.25

22.58 ± 6.60

21.91 ± 5.37

 < 0.01

Number of admissions with outcomes (n)

 IHCA/1000 adm

0.90 (50)

1.71 (15)

0.71 (13)

1.66 (15)

0.36 (7)

–

 UIT/1000 adm

6.44 (355)

12.67 (111)

5.32 (97)

7.09 (64)

4.34 (83)

–

 Borderline/1000 adm

15.70 (865)

23.41 (205)

12.29 (224)

26.05 (235)

10.52 (201)

–

 DNR suggestion/1000 adm

1.01 (56)

2.51 (22)

0.49 (9)

2.32 (21)

0.20 (4)

–