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Table 1 The baseline characteristics of the study population. Plateau pressure, respiratory system compliance and arterial blood gas data were measured during the study, standardised at 5 cmH2O PEEP.

From: Nitrogen washout/washin, helium dilution and computed tomography in the assessment of end expiratory lung volume

Characteristics Value
Age – years 66 ± 10
Female sex – number (%) 9 (30)
BMI – kg/m2 26 ± 8
Tidal volume – ml/kg of predicted body weight 8 ± 1
Minute ventilation – L/minute 7.5 ± 1.8
Respiratory rate – breaths/minute 14 ± 3
Clinical PEEP – cmH2O 8.3 ± 3.3
Plateau pressure – cmH2O 19 ± 4
Respiratory system compliance – ml/cmH2O 43 ± 18
Respiratory system resistance – cmH2O/L/second 22 ± 9
PaO2/FiO2 – mmHg 190 ± 71
FiO2 0.50 ± 0.13
PaCO2 – mmHg 41 ± 9
Arterial pH 7.422 ± 0.061
Cause of lung injury – number  
Pneumonia 6
Sepsis 11
Aspiration 3
Trauma 5
Other 5
Type of lung injury – number  
ARDS 20
Acute lung injury 7
Other (PaO2/FiO2 > 300 mmHg) 3
  1. ARDS = acute respiratory distress syndrome; BMI = body mass index; FiO2 = inspired oxygen fraction; PaCO2 = partial arterial pressure of carbon dioxide; PEEP = positive end expiratory pressure.