CREATE TABLE table_238124_1 (prothrombin_time VARCHAR, condition VARCHAR)

What is the prothrombin time of von willebrand disease?
SELECT COUNT(prothrombin_time) FROM table_238124_1 WHERE condition = "Von Willebrand disease"
SELECT COUNT("prothrombin_time") FROM "table_238124_1" WHERE "Von Willebrand disease" = "condition"