Table 1 Distributions of major clinical data and study items ^a

Mean age (years)

61

62

61

0.515^b

Gender (n)

Male

1,944

124 (71.9%)

1,820 (67.0%)

0.293^c

Female

947

51 (29.1%)

896 (33.0%)

Emergency (n)

No

2,455

71 (40.6%)

2,384 (87.8%)

<0.001^c

Yes

436

104 (59.4%)

332 (12.2%)

Source (n)

Medical

105

15 (8.6%)

90 (3.3%)

<0.001^c

Surgical

2,786

160 (91.4%)

2,626 (96.7%)

Transfusion (n)

No

2,571

151 (86.3%)

2,420 (89.1%)

0.250^c

Yes

320

24 (13.7%)

296 (10.9%)

Mechanical ventilation (n)

No

2,550

149 (85.1%)

2,401 (88.4%)

0.201^d

NIV

21

1 (0.6%)

20 (0.7%)

Intubation

246

22 (12.6%)

224 (8.2%)

Tracheotomy

74

3 (1.7%)

71 (2.7%)

Median APACHE II score

8

14

8

<0.001^b

ICU outcome (n)

Dead

125

27 (15.4%)

98 (3.6%)

<0.001^c

Alive

2,766

148 (74.6%)

2,618 (96.4%)

Median LOS_HOS (days)

14

16

14

0.581^b

Median LOS_ICU (hours)

24

42

24

0.011^b

Mortality (28 days), n (%)

111 (3.8%)

25 (14.3%)

86 (3.2%)

<0.001^c