High injury severity scores correlate with high VWF propeptide, high VWF antigen levels, and low ADAMTS13 antigen levels. Line represents a linear regression line. Dotted lines represent the 95% confidence interval. (A) VWF propeptide levels. (B) VWF antigen. (C) ADAMTS13 antigen. (D) ADAMTS13 activity. All measures are calculated to percentage of normal human plasma levels.