Table 3 Unadjusted and multivariate adjusted odds ratio of death for OI, Pao2/Fio2 and Crs
Unadjusted OR (95% CI)Multivariate OR* (95% CI)
OI (per SD increase)1.89 (1.28 to 2.78)1.84 (1.12 to 3.04)
Pao2/Fio2 (per SD decrease)1.57 (1.09 to 2.26)1.28 (0.82 to 2.02)
Crs (per SD decrease)1.22 (0.86 to 1.72)1.23 (0.77 to 1.96)
  • OR per standard deviation increase in OI (SD 57.8) and decrease in Pao2/Fio2 (SD 8.3) and Crs (SD = 10.3). Data were partially missing for 22 patients.

  • *Controlled for age, sex, presence of chronic obstructive pulmonary disease, pneumonia, trauma, use of vasopressors, pH and APACHE II score.

  • Crs, compliance; OI, oxygenation index; Pao2/Fio2, ratio of arterial oxygen partial pressure to inspired oxygen fraction.