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Table 1 Characteristics of patients

From: Association between administered oxygen, arterial partial oxygen pressure and mortality in mechanically ventilated intensive care unit patients

  Analysis of data from first 24 h after admission Analysis of data from all admission days
No of patients 36,307 3,322
Male (%) 60.1 60.3
Age in yearsa 62.5 ± 16.1 62.4 ± 15.9
SAPS IIa 42.7 ± 18.4 47.6 ± 15.7
SAPS II predicted mortalitya 0.34 ± 0.28 0.42 ± 0.27
GCS score below 15 (%) 33.1 33.6
PaO2 at admission (kPa)a 13.2 ± 6.5b 12.5 ± 5.5c
FiO2 (%)a 50.4 ± 19.9b 53.1 ± 18.7c
PaO2/FiO2 ratio (kPa)a 29.1 ± 15.0b 24.6 ± 12.6c
Admission type (%):   
   Medical 48.4 61.0
   Unplanned surgery 22.6 23.0
   Planned surgery 28.9 16.0
Referring specialty (%):   
   Internal medicine 16.4 16.7
   Cardiology 10.8 17.9
   Pulmonary disease 7.4 10.4
   Neurology 5.7 6.4
   Surgery 33.2 30.6
   Cardiothoracic surgery 6.4 1.2
   Neurosurgery 6.9 6.1
   Other 13.1 10.7
ICU mortality 23.0 21.0
In-hospital mortality (%) 31.1 32.7
  1. aMean ± standard deviation (SD); bPaO2, FiO2 and PaO2/FiO2 ratio from sample with lowest PaO2/FiO2 ratio within 24 h after admission; cmean value of all admission days. Per day PaO2, FiO2 and PaO2/FiO2 ratio was taken from sample with lowest PaO2/FiO2 ratio.
  2. GCS, Glasgow Coma Scale; FiO2, fraction of oxygen in inspired air; ICU, intensive care unit; PaO2, partial oxygen pressure; SAPS II, Simplified Acute Physiology Score II.