Table 1.
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.