Table 2 Characteristics at diagnosis of ALI/ARDS

Number

20

33

Age, years; median (interquartile range)

70.5 (42–81.8)

60.5 (46.5–79.3)

0.436

Female sex, n (percentage)

13 (65.0)

21 (63.6)

1

McCabe score

Non-fatal

14 (70.0)

23 (69.7)

Ultimately fatal

5 (25.0)

9 (27.3)

0.927

Fatal

1 (5.0)

1 (3.0)

Medical (versus surgical) admission

13 (65.0)

20 (60.6)

0.369

Antecedent clinical risk conditions, n (percentage)

Sepsis

16 (80.0)

30 (90.9)

0.405

Pneumonia

10 (50.0)

15 (45.5)

0.783

Aspiration

1 (5.0)

1 (3.0)

1

Trauma

0

0

1

Transfusions

2 (10.0)

1 (3.0)

0.549

Pancreatitis

0

1 (3.0)

1

Pulmonary contusion

0

0

1

Shock

6 (30.0)

15 (45.5)

0.386

Other

1 (5.0)

0

0.377

On day of clinical risk development, median (IQR) or n (percentage)

SAPS II

37.5 (24.0–47.8)

37 (28.0–41.5)

0.604

Mean arterial pressure (mmHg)

86 (71–103)

73 (65–85)

0.076

Multiple organ dysfunction score

2 (1–3.75)

6 (4–7)

0.008

Location, percentage on ward versus ICU

12 (60)

5 (15.2)

0.002

PaO₂/FiO₂, mmHg

229 (210–264)

98 (78.5–146)

<0.001

Receiving mechanical ventilation, percentage

7 (35)

22 (66.7)

0.045

Tidal volume (ml)

600 (500–600)

550 (500–600)

0.615

Positive end-expiratory pressure, cmH₂O

5 (5–8)

8 (5–10.5)

0.086

Ventilator mode, percentage volume-cycled ventilation

7 (100)

20 (91)

1

Days from clinical insult to ALI/ARDS diagnosis

0 (0–3)

2 (0–4)

0.14