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Table 2 Patients characteristics at study entry

From: Intracranial pressure responsiveness to positive end-expiratory pressure is influenced by chest wall elastance: a physiological study in patients with aneurysmal subarachnoid hemorrhage

  All patients (n = 30) Responders (n = 15) Non-responders (n = 15) p *
Age (years) 55 (37–66) 66 (42–73) 42 (37–57) 0.045
Male 21 (70) 10 (67) 11 (73) 0.500
BMI (kg/m2) 22.8 (22.0–24.2) 22.0 (21.2–23.6) 23.6 (22.0–24.2) 0.039
GCS 5.5 (4.0–6.3) 5.0 (4.0–7.0) 6.0 (5.0–6.0) 0.513
SAPS II 49.5 (46.3–54.6) 49.7 (44.0–57.0) 49.0 (47.0–54.0) 0.400
MV duration (days)a 1.0 (1.0–2.0) 1.0 (1.0–2.0) 2.0 (1.0–2.0) 0.345
ARDS diagnosis 6 (20) 4 (27) 2 (13) 0.361
PaO2 105.5 (78.0–153.5) 95.0 (76.7–130.0) 129.0 (78.4–168.0) 0.242
PaO2/FiO2 264 (180–384) 274 (156–325) 323 (196–420) 0.144
PaCO2 (mmHg) 35.3 (32.6–36.7) 35.4 (32.7–38.1) 35.1 (30.9–36.1) 0.307
  1. Data are presented as median (interquartile range) for continuous variables and counts (percentages) for categorical variables
  2. ARDS acute respiratory distress syndrome, BMI body mass index, GCS Glasgow Coma Scale, MV mechanical ventilation, SAPS II Simplified Acute Physiology Score II
  3. *p value in comparison between the responder and non-responder group
  4. aMV duration before enrolment