Figure 2.

Von Willebrand factor (VWF) levels are higher in non-O blood group children than O blood group children and decrease after 72 hours. Enzyme-linked immunosorbent assay results show the distribution of VWF levels as a percent of normal. The gray horizontal bars indicate the median, and the bracketed numbers indicate number of samples tested. Group VWF levels were compared with Wilcoxon rank sum tests, and P values are reported for the different comparisons. A, Von Willebrand factor levels in O and non-O phenotypes in community children (CC), children with uncomplicated malaria (UM), and children with cerebral malaria (CM). B, Serum VWF levels 72 hours postadmission in the children with CM, O and non-O blood groups.