Figure 4.

Change from baseline Murray Lung Injury Score of mechanically ventilated patients

Error bars indicate lower boundary of SE. At baseline, there were 128 patients in the heparin group and 124 patients in the placebo group; loss of data is due to death (n=6 in each group by day 5), transfer to another intensive care unit (n=3 in the heparin group after day 1), and separation from mechanical ventilation (n=61 in the heparin group; n=57 in the placebo group by day 5)