... predictor variables measured at day1,day6,andthechangeinvaluebetweenday1and6.Stata 9.0 (StataCorp, College Station, Texas) computersoftware was used for statistical analysis. All intervaldata in ... BD,PaO2/FiO2,age,gender,COPD,pneumonia,vasopres-sors, APACHEII. In the multivariate analyses (Table 3),as in the bivariate analyses, OI was the only variableassociated with death on the first day of lung injury (OR2.16, ... mechanically ventilated formore than 6 days. Using multivariate analysis, we foundthat both the absolute value of respiratory system com-pliance on day 6 and the decrease in respiratory systemcompliance...