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. Author manuscript; available in PMC: 2015 Jul 22.
Published in final edited form as: Ann Rheum Dis. 2014 Jan 7;74(5):830–835. doi: 10.1136/annrheumdis-2013-203967

Table 1.

Phases of development for the ASAS Health Index

Phase Aims Methods
Ia Preparatory Development of a pool of items representing the categories of the Comprehensive ICF Core Set for AS Linkage of various assessment tools for functioning and health to ICF categories
Ib Patient meeting Patient preference and weighting of the items per ICF category Relative weight to each item, patient-distributed 100 points per ICF category.
II 1st international cross-sectional survey Item reduction (within and across ICF categories) Rasch analysis, Spearman’s rank correlation coefficient
III Expert consultation Agreement on item reduction Nominal consensus process
IV 2nd international cross-sectional survey Validation of the draft version and further item reduction Testing psychometric properties Rasch analysis
V Consensus Meeting Agreement on a final version Nominal consensus process

AS, ankylosing spondylitis; ASAS, Assessment of SpondyloArthritis international Society; ICF, International Classification of Functioning, Disability and Health.