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Table 1 Demographic and clinical data

From: Comparison of non-invasive to invasive oxygenation ratios for diagnosing acute respiratory distress syndrome following coronary artery bypass graft surgery: a prospective derivation-validation cohort study

Variables Total Derivation group Validation group P-value
Age Mean ± SD 70.17 ± 12.17 69.21 ± 12.18 70.64 ± 12.16 0.20
Sex, Female (%) 270 (50.7) 90 (51.4) 180 (50.3) 0.80
DoI, hours Mean ± SD 49.14 ± 27.63 47.12 ± 29.07 50.12 ± 26.88 0.24
PAO2 Mean ± SD 228.54 ± 24.30 225.83 ± 23.17 229.86 ± 24.75 0.07
PaO2 Mean ± SD 94.15 ± 3.30 93.21 ± 3.89 94.62 ± 2.87 0.20
SPO2 Mean ± SD 94.13 ± 1.69 94.05 ± 1.60 94.17 ± 1.75 0.46
pH Mean ± SD 7.41 ± 0.06 7.40 ± 0.06 7.42 ± 0.06 0.07
PaCO2 Mean ± SD 45.41 ± 3.77 44.71 ± 4.36 45.75 ± 3.39 0.09
FiO2 Mean ± SD 27.61 ± 2.85 27.6 ± 3.12 27.61 ± 2.72 0.96
Hgb Mean ± SD 11.19 ± 1.52 10.86 ± 1.63 11.35 ± 1.43 < 0.001
P/F Mean ± SD 344.76 ± 38.28 342.09 ± 41.79 346.07 ± 36.42 0.26
PA/F Mean ± SD 837.19 ± 126.70 828.94 ± 127.32 841.23 ± 126.37 0.29
S/F Mean ± SD 344.39 ± 34.16 344.78 ± 36.22 384.00 ± 33.21 0.856
OI Mean ± SD 4258.47 ± 809.76 4281.55 ± 765.33 4247.19 ± 831.42 0.65
OSI Mean ± SD 4254.35 ± 796.11 4230.81 ± 703.39 4265.86 ± 838.41 0.63
Survival, alive n (%) 446 (83.7) 150 (85.7) 296 (82.7) 0.37
  1. DoI means duration of intubation; PAO2 means partial pressure of O2 in alveoli; PaO2means partial pressure of O2 in arterial blood; SpO2 means peripheral capillary oxygen saturation; PaCO2 means partial pressure of CO2 in arterial blood; FiO2 means fraction of inspired oxygen; Hgb means hemoglobin; S/F means SPO2/FiO2 ratio; P/F means PaO2/FiO2ratio; PA/F means PAO2/FiO2 ratio; OI means Oxygen Index; OSI means Oxygen Saturation Index