VWF:RCo assay compared with VWF GPIb complex-binding assay. The first 2 columns show VWF:RCo/VWF:Ag ratio (●) for subjects with and without the D1472H polymorphism. The second 2 columns show the GPIb complex-binding assay/VWF:Ag ratio (○) for subjects with and without the D1472H polymorphism. The mean value for each group is listed at the top of the graph. Error bars represent ± 1 SD.