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Table 2 Adjusted odds ratios for partial oxygen pressure (PaO2) and fraction of oxygen in inspired air (FiO2) resulting from a multivariate regression analysis on data from the first 24 h after ICU admission

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

Covariate Odds ratio 95% Confidence interval
PaO2 in kPa:   
   < 8.9 (n = 6,937) 1.12 1.03 to 1.21
   8.9 to 10.6 (reference category) (n = 7,466) 1  
   10.6 to 12.6 (n = 6,430) 1.11 1.02 to 1.21
   12.6 to 16.4 (n = 7,278) 1.08 1.00 to 1.18
   ≥ 16.4 (n = 8,196) 1.23 1.13 to 1.34
   FiO2 (per 10%) 1.12 1.10 to 1.13
  1. Odds ratio after adjustment for the following potential confounders: age, SAPS II, GCS score below 15, admission type, individual hospital. The equation of the model is: Logit(p) = -5.419 + 0.059 × age (per 5 years) + 0.066 × SAPS II + 0.070 × I(GCS < 15) + 0.221 × I(admission type = urgent) + 0.453 × I(admission type = medical) + βhosp + 0.105 × FiO2 (per 10%) + 0.109 × I(PaO2 < 67) + 0.109 × I(80 ≤ PaO2 < 95) +0.079 × I(95 ≤ PaO2 < 123) +0.206 × I(PaO2 ≥ 123) Probability of in-hospital death = e(logit)/(1+e(logit)). Median βhos for individual hospitals was -0.12 (IQR -0.43 to 0.05).
  2. GCS, Glasgow Coma Scale; ICU, intensive care unit; IQR, interquartile range; SAPS II, Simplified Acute Physiology Score II.