Final Answer:
In type I vW disease, the vW factor Ag is decreased, activity is decreased and FVIII levels are decreased.
Step-by-step explanation:
In type I von Willebrand disease (vW disease), the von Willebrand factor (vW factor) antigen (Ag) levels are decreased. Additionally, both the activity of the von Willebrand factor and factor VIII (FVIII) levels are also decreased in individuals with type I vW disease. This condition results from a quantitative deficiency of vW factor, leading to impaired platelet function and coagulation.