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Table 3 Adjusted odds ratios for mean partial oxygen pressure (PaO2) value and mean fraction of oxygen in inspired air (FiO2) during ICU stay resulting from a multivariate regression analysis on data from the entire ICU stay

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

Covariate Odds ratio 95% Confidence interval
Mean PaO2 in kPa:   
   < 8.9 (n = 402) 1.63 1.16 to 2.3
   8.9 to 10.6 (n = 871) 1.51 1.18 to 1.96
   10.6 to 12.6 (n = 970) 1.25 0.99 to 1.57
   12.6 to 16.4 (reference category) (n = 841) 1  
   > 16.4 (n = 238) 1.04 0.64 to 1.68
   Mean FiO2 (per 10%) 1.63 1.47 to 1.81
  1. Odds ratio after adjustment for the following potential confounders: age, SAPS II, GCS score below 15, admission type, PaO2/FiO2 ratio at admission, and hospital. The equation of the eventual model is: Logit(p) = -7.060 + 0.090 × age (per 5 years) + 0.049 × SAPS II + 0.054 × I(GCS < 15) + 0.015 × I(admission type = urgent) + 0.161 × I(admission type = medical) + 0.004 × PaO2/FiO2 – 1.114 × I(hospital = 2) – 0.060 × I(hospital = 3) – 0.285 × I(hospital = 4) – 0.618 × I(hospital = 5) + 0.488 × mean FiO2 (per 10%) + 0.492 × I(mean PaO2 < 67) + 0.417 × I(67 ≤ PaO2 < 80) + 0.221 × I(80 ≤ PaO2 < 95) + 0.038 × I(PaO2 ≥ 123). Probability of in-hospital death = e(logit)/(1+e(logit)).
  2. GCS, Glasgow Coma Scale; ICU, intensive care unit; SAPS II, Simplified Acute Physiology Score II.