Lung tissue myeloperoxidase specific activity. mU/mg protein means milliunit per mg protein of lung tissue. NL, normal healthy control group; NG, acute lung injury with normoglycemia group; HG, acute lung injury with hyperglycemia group; HG-VI, acute lung injury with hyperglycemia treated with intravenous insulin group; HG-AI, acute lung injury with hyperglycemia treated with aerosolized insulin group; MPO, myeloperoxidase. Boxes extend from the 25th to 75th percentile; the horizontal line shows the median. Error bars show the minimum and maximum. *P <0.05 compared with the NL group.