Table 1 Patients’ characteristics

Age (years)

74 ± 9.7

Female, n (%)

6 (25)

Body Mass Index (kg m⁻²)

26.7 ± 6.7

Height (cm)

168 ± 8.6

Days on mechanical ventilation at enrollment

9 (3–21)

Patients with tracheostomy on study day, n (%)

7 (30)

PEEP (cmH₂O)

6 ± 1

FIO₂

0.4 ± 0.08

pH

7.46 ± 0.04

PaCO₂ (mmHg)

38 ± 5

PaO₂ (mmHg)

88 ± 25

Hospital mortality, n (%)

4 (16%)

Length of stay in Intensive Care Unit (days)

25 (15–35)

Diagnosis

 ARDS

12 (50%)

 COPD exacerbation

5 (21%)

 Sepsis

10 (42%)

 Trauma

3 (13%)