Average staining intensity for VWF and PECAM according to ABO blood type
| Blood type | VWF average staining intensity | PECAM-1 average staining intensity | VWF:PECAM-1 intensity ratio |
| Group O (n=46 vessels) | 0.366 | 0.623 | 0.595 |
| Group A (n=57 vessels) | 0.595 | 0.598 | 1.022 |
| Group B (n=22 vessels) | 0.697 | 0.567 | 1.320 |
| Group AB (n=23 vessels) | 0.666 | 0.494 | 1.521 |
PECAM-1, platelet/endothelial cell adhesion marker-1; VWF, von Willebrand factor.