9.9. Bath Ankylosing Spondylitis Disease Activity Index (BASDAI)


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Six numerical rating scales.

  1. Add scores for questions 1–4

  2. Calculate the mean for questions 5 and 6

  3. Add A and B (giving a score in the range 0-50) and divide by 5

The higher the BASDAI score, the more severe the patient’s disability due to their ankylosing spondylitis (AS).

9.9.1. Intellectual property rights


Mapi Trust website states “This questionnaire is in the public domain.”

Braun et al. (2014, p. S-100) state “Another major difference between BASDAI and ASDAS is that the latter is entirely in the public domain while the BASDAI, since 2011, is only free of charge to academic users while industry has to pay because of a copyright held by A. Calin represented by the MAPI trust (Mapi Research Trust, 27 rue de la Villette, 69003 Lyon, France).

9.9.2. History

  • Garrett S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P, Calin A (1994). A new approach to defining disease status in ankylosing spondylitis: the Bath Ankylosing Spondylitis Disease Activity Index. J Rheumatol 21(12):2286-2291. https://pubmed.ncbi.nlm.nih.gov/7699630/

For copyright status, see also:

  • Braun J, Kiltz U, Baraliakos X, van der Heijde D (2014). Optimisation of rheumatology assessments - the actual situation in axial spondyloarthritis including ankylosing spondylitis. Clin Exp Rheumatol. 32(5 Suppl 85): S96-S104. https://www.ncbi.nlm.nih.gov/pubmed/25365096

  • Moncur C (2003). Ankylosing Spondylitis Measures: The Ankylosing Spondylitis Quality of Life (ASQOL) Scale, Bath AnkylosingSpondylitis Disease Activity Index (BASDAI), Bath Ankylosing SpondylitisFunctional Index (BASFI), Bath Ankylosing Spondylitis Global Score (BAS-G),Bath Ankylosing Spondylitis Metrology Index (BASMI), Dougados FunctionalIndex (DFI), Health Assessment Questionnaire for the Spondyloarthropathies(HAQ-S), and Revised Leeds Disability Questionnaire (RLDQ). Arthritis and Rheumatism 49(5S): S197–209. https://doi.org/10.1002/art.11412.

9.9.3. Source