Final answer:
Type 1 von Willebrand disease (vWD) is the most common form, accounting for 75% to 80% of all vWD cases, and is characterized by a quantitative deficiency of von Willebrand factor.
Step-by-step explanation:
The type of von Willebrand disease (vWD) that is most common is Type 1 vWD. It accounts for about 75% to 80% of all vWD cases. Von Willebrand disease is a genetic disorder that affects the blood's ability to clot. Type 1 vWD is characterized by a quantitative deficiency of von Willebrand factor, which is less severe compared to other types of vWD. This is why symptoms in Type 1 vWD tend to be milder and why it is more common among the population.