title: Factor IX activity/antigen ratio and the risk of first unprovoked venous thromboembolism.
authors: Elena
authors: E
authors: Campello
authors: Luca
authors: L
authors: Spiezia
authors: Cristiana
authors: C
authors: Bulato
authors: Sabrina
authors: S
authors: Gavasso
authors: Barry
authors: B
authors: Woodhams
authors: Paolo
authors: P
authors: Simioni
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000097:blood; D001777:Blood Coagulation; D001780:Blood Coagulation Tests; D016022:Case-Control Studies; D005164:Factor IX / Q000032:analysis*; D015949:Factor IXa / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D018570:Risk Assessment; D012307:Risk Factors; D054556:Venous Thromboembolism / Q000097:blood / Q000209:etiology*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D005164:Factor IX; D015949:Factor IXa