Table 3 Ventilation characteristics at day 1 and 7 of colonization

Tidal volume, ml/kg, day 1

7 (2)

7 (2)

0.77

Tidal volume, ml/kg, day 7

7 (3)

8 (3)

0.50

PEEP, cm H₂O, day 1

9 (4)

9 (4)

0.10

PEEP, cm H₂O, day 7

6 (5)

10 (6)

0.004

Compliance, mL/cm H₂O, day 1

37 (28)

44 (39)

0.05

Compliance, mL/cm H₂O, day 7

40 (27)

41 (36)

0.09

P_aO₂/ F_IO₂ ratio, day 1

213 (122)

197 (137)

0.40

P_aO₂/ F_IO₂ ratio, day 7

282 (123)

217 (147)

0.005

Chest X-ray, no. of quadrants, day 1

2 (2)

2 (1)

0.27

Chest X-ray, no. of quadrants, day 7

2 (3)

2 (2)

0.41

LIS, day 1

2.0 (1.0)

1.8 (1.3)

0.47

LIS, day 7

1.0 (1.3)

1.8 (1.5)

0.002

Ventilation after day 1, days

7 (9)

20 (16)

<0.001