Influence of ABO blood group on VWF:Ag, VWFpp, and ratio of VWFpp to VWF:Ag in healthy individuals. (A) VWF:Ag levels in healthy individuals of blood group O, A, B, or AB. The horizontal line represents the median VWF:Ag value. (B) VWFpp levels in healthy individuals of blood group O, A, B, or AB. The horizontal line represents the median VWFpp value. (C) Ratio of VWFpp to VWF:Ag in healthy individuals of blood group O, A, B, or AB. The horizontal line represents the median value of the ratio. (D) Ratio of VWFpp to VWF:Ag in family members with a VWF mutation or without a mutation. The horizontal line represents the median value of the ratio.