Assessment in Ankylosing Spondylitis response criteria (ASAS 20/40/50/70)

Anderson JJ; Baron G; van der Heijde D; Felson DT; Dougados M


Basic description

  • Developed in 2001.
  • The ASAS Response Criteria (ASAS 20) is defined as an improvement of at least 20% and an absolute improvement of at least 10 units on a 0-100 scale in at least three of the following domains: Patient global assessment, Pain assessment, Function (BASFI), and Inflammation (last 2 questions of BASDAI).
  • ASAS 40, 50 and 70 are defined as above with improvements of at least 40%, 50% and 70% respectively.

Anderson JJ; Baron G; van der Heijde D; Felson DT; Dougados M

No information
To measure short-term improvement in patients with ankylosing spondylitis
Therapeutic area
  • Musculoskeletal Diseases
Therapeutic indication

Spondylitis, Ankylosing

Type of Clinical Outcome Assessment (COA)
  • pro PRO
Original language(s)
  • English for the USA
Bibliographic reference(s) of the original questionnaire

Anderson JJ, Baron G, van der Heijde D, Felson DT, Dougados M. Ankylosing spondylitis assessment group preliminary definition of short-term improvement in ankylosing spondylitis. Arthritis Rheum. 2001 Aug;44(8):1876-86 (Full text article)

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