Table 4.

Proportional hazards model for time to death on the basis of baseline covariates

VariablesHazards Ratio95% CIP
Age1.021.006 to 1.040.008
Female gender0.430.22 to 0.870.01
Tidal volume: 12-ml/kg group2.21.2 to 40.003
APACHE III1.011.007 to 1.030.001
Sepsis1.230.61 to 2.50.55
Pao2/Fio20.990.991 to 1.00.08
Baseline creatinine0.70.2 to 2.30.57
Baseline urine output0.910.78 to 1.050.2
Baseline IL-18 level on day 00.0001
    >25 pg/ml1.10.6 to 2
    >50 pg/ml1.230.6 to 2.2
    >100 pg/ml1.60.8 to 2.9
    >200 pg/ml2.321.2 to 4.4
    >500 pg/ml5.12 to 13.1