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Table 1 Baseline characteristic of the entire cohort and after propensity score matching analysis

From: Effect of prone position in patients with acute respiratory distress syndrome supported by venovenous extracorporeal membrane oxygenation: a retrospective cohort study

 

Not propensity score matched

Propensity score matched

Entire cohort (n = 91)

Prone group (n = 38)

Supine group (n = 53)

p

Prone group (n = 25)

Supine group (n = 25)

p

Males [n (%)]

64 (70.3)

29 (76.3)

35 (66)

0.29

18 (72)

16 (64)

0.544

Age (years)

49 (37–63)

41 (31–50)

58 (44–64)

0.001b

46.68 ± 13.42

48.36 ± 13.29

0.658

BMI (kg/m2)

24.77 (22.03–28.27)

25.25 (22.25–28.54)

24.6 (20.94–28.09)

0.566

25.85 ± 3.99

26.24 ± 5.88

0.785

Cause of ARDS [n (%)]

 Bacteria

20 (22)

5 (13.2)

15 (28.3)

0.113

4 (16)

8 (32)

0.185

 Fungal

6 (6.6)

3 (7.9)

3 (5.7)

0.536

1 (4)

1 (4)

1

 PCP

15 (16.5)

4 (10.5)

11 (20.8)

0.228

4 (16)

3 (12)

0.684

 Viral

57 (62.6)

32 (84.2)

25 (47.2)

0.001b

20 (80)

16 (64)

0.208

 Influenza virus

43 (47.3)

24 (63.2)

19 (35.9)

0.010a

13 (52)

13 (52)

1

Comorbidities [n (%)]

       

 Hypertension

17 (34)

8 (32)

9 (36)

0.765

8 (32)

9 (36)

0.765

 Diabetes mellitus

10 (20)

7 (28)

3 (12)

0.157

7 (28)

3 (12)

0.157

 Chronic heart failure

1 (2)

0

1 (4)

1

0

1 (4)

1

 Chronic renal disease

1 (2)

0

1 (4)

1

0

1 (4)

1

 COPD

0

0

0

 

0

0

 

 Asthma

2 (4)

1 (4)

1 (1)

1

1 (4)

1 (1)

1

 Tuberculosis

1 (2)

0 (0)

1 (4)

1

0 (0)

1 (4)

1

 Chronic liver disease/cirrhosis

2 (4)

0 (0)

2 (8)

0.490

0 (0)

2 (8)

0.490

 Immunocompromised status

14 (28)

7 (28)

7 (28)

1

7 (28)

7 (28)

1

 Cerebrovascular disease

3 (6)

2 (8)

1 (4)

1

2 (8)

1 (4)

1

Smoking [n (%)]

54 (59.3)

24 (63.2)

30 (56.6)

0.530

14 (56)

16 (64)

0.564

Alcohol [n (%)]

14 (15.4)

7 (18.4)

7 (13.2)

0.317

5 (20)

4 (16)

0.546

MV before ECMO (h)

48 (11–120)

55.5 (20–132)

45 (7.5–120)

0.291

49 (22–144)

62 (16.5–120)

0.596

PP before ECMO [n (%)]

31 (34.1)

14 (26.4)

17 (44.7)

0.069

11 (44)

7 (28)

0.239

Before ECMO

 IPPV

82 (90.1)

38 (100)

44 (83)

0.009b

25 (100)

25 (100)

1

 Barotrauma [n (%)]

18 (19.8)

12 (31.6)

6 (11.3)

0.017a

6 (24)

4 (16)

0.480

 PaO2/FiO2 (mmHg)

64.9 (56–88.7)

65.9 (55.88–82.60)

63.3 (56–91.75)

0.449

65.70 (60.60–84.00)

63 (48.65–95.35)

0.810

Fluid balance (mL)

0 (− 3653 to 2060)

190 (− 4080 to 2119)

0 (− 3593 to 2589)

0.705

381 (− 2625 to 1799)

0 (− 3894 to 4769)

0.938

  1. ECMO, extracorporeal membrane oxygenation; ICU, intensive care unit; MV, mechanical ventilation; IPPV, invasive positive pressure ventilation
  2. ap < 0.05; bp < 0.01
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BMC Pulmonary Medicine

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