Covariate

Odds ratio

95% Confidence interval


PaO_{2} 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

FiO_{2} (per 10%)

1.12

1.10 to 1.13

 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) + β_{hosp} + 0.105 × FiO_{2} (per 10%) + 0.109 × I(PaO_{2} < 67) + 0.109 × I(80 ≤ PaO_{2} < 95) +0.079 × I(95 ≤ PaO_{2} < 123) +0.206 × I(PaO_{2} ≥ 123) Probability of inhospital death = e^{(logit)}/(1+e^{(logit)}). Median β_{hos} for individual hospitals was 0.12 (IQR 0.43 to 0.05).
 GCS, Glasgow Coma Scale; ICU, intensive care unit; IQR, interquartile range; SAPS II, Simplified Acute Physiology Score II.