Table 1 Clinical characteristics of studied patients

Age (years, mean ± SD)

52.635 ± 15.556

53.50 ± 15.969

52.38 ± 16.020

0.786#

Gender (n, %)

 Male

38 (73.1%)

6 (50.0%)

32 (80.0%)

0.05*

 Female

14 (26.9%)

6 (50.0%)

8 (20.0%)

Smoking

26 (68.4%)

5 (41.7%)

21 (52.5%)

0.372

BMI (kg/m², mean ± SD)

31.79 ± 4.90

29.750 ± 5.2245

32.400 ± 4.8294

0.037#*

 < 30

15 (28.8%)

8 (66.7%)

7 (17.5%)

0.002*

  ≥ 30

37 (71.2%)

4 (33.3%)

33 (82.5%)

Comorbidities

 COPD

21 (40.4)

3 (25.0%)

18 (45.0%)

0.184

 Diabetes mellitus

30 (57.7)

5 (41.7%)

25 (62.5%)

0.171

 Hypertension

22 (42.3)

3 (25.0%)

19 (47.5%)

0.147

 IHD

10 (19.2)

3 (25.0%)

7 (17.5%)

0.418

 CKD

19 (36.5)

2 (16.7%)

17 (42.5%)

0.09

Reason for ventilation

 Severe pneumonia

10 (19.2%)

2 (16.7%)

8 (20.0%)

0.582

 Septic shock

3 (5.8%)

1 (8.3%)

2 (5.0%)

0.553

 Coma

2 (3.8%)

0 (0%)

2 (5.0%)

0.588

 Cardiac arrest

6 (11.5%)

0 (0%)

6 (15%)

0.189

 COPD/asthma

19 (36.5%)

3 (25%)

16 (40%)

0.277

 Hypovolemic shock

1 (1.9%)

0 (0%)

1 (2.5%)

0.769

 ARDS

3 (5.8%)

3 (25%)

0 (0%)

0.01*

 Other

9 (17.3%)

4 (33.3%)

5 (12.5%)

0.111

Outcome

 ICU mortality

Died

10 (19.2%)

5 (41.7%)

5 (12.5%)

0.03*

Discharge

42 (80.8%)

7 (58.3%)

35 (87.5%)

Duration of hospital stay

 Days, mean ± SD

8.41 ± 3.414

12.00 ± 4.200

7.34 ± 2.262

0.0001#*

Mode of initial ventilation

 SIMV

22 (42.3%)

2 (16.7%)

20 (50.0%)

0.01*

 AC

30 (57.7%)

10 (83.3%)

20 (50%)

Duration of ventilation

4.73 ± 2.598

5.92 ± 3.753

4.38 ± 2.072

0.128#

RSBI

94.8462 ± 8.56

92.0000 ± 6.16

95.7000 ± 9.04

0.080

Simple weaning

 Yes

29 (55.8%)

0 (0%)

29 (72.5%)

0.0001*