The ASAS Health Index has been developed under the auspices of the Assessment of SpondyloArthritis international Society (ASAS) to assess health in patients with all forms of spondyloarthritis
(SpA) (specifically radiographic and non-radiographic axial SpA as well as peripheral SpA). The self-reprt questionnaire measures functioning and health across 17 aspects of health and 9
environmental factors (EF) in patients with SpA . The items measure the concept of ‘functioning, disability and health’ – a concept which is conceptualized in the International Classification
of Functioning, Disability and Health (ICF). The ICF, a model to systematically classify and describe functioning, disability and health in human beings, has been used by ASAS as a basis to
define a core set of items that are typical and relevant for patients with ankylosing spondylitis (AS) . Based on this ICF core set for AS an item pool has been developed containing various
items which are linked to specific ICF categories. The performance of the item pool has been tested and analyzed with Rasch Analysis. The best performing items have been included in the final
measure. The ASAS HI contains items addressing categories of pain, emotional functions, sleep, sexual function, mobility, self care, and community life. The EF Item Set contains items addressing
categories of support/relationships, attitudes and health services. Validation was done
in patients with radiographic and non-radiographic axial SpA as well as peripheral SpA.
1. U Kiltz, D van der Heijde, A Boonen, A Cieza, G Stucki, M A Khan, W P Maksymowych, H Marzo-Ortega, J Reveille, S Stebbings, C Bostan, J Braun. Development of a health index in
patients with ankylosing spondylitis (ASAS HI): final result of a global initiative based on the ICF guided by ASAS. Ann Rheum Dis, 2015;74:830-5.
2. Boonen A, Braun J, van der Horst Bruinsma IE, Huang F, Maksymowych W, Kostanjsek N, Cieza A, Stucki G, van der Heijde D. ASAS/WHO ICF Core Sets for ankylosing spondylitis (AS): how to classify the impact of AS on functioning and health. Ann Rheum Dis, 2010;69:102-7.