Details of the final 17 items of the ASAS HI
| Summary statistics | Person-Separation Index | χ2 Probability | Item location (mean±SD) | Item fit residual (mean±SD) | Person location (mean±SD) | Person Fit residual (mean±SD) |
|---|---|---|---|---|---|---|
| ASAS Health Index (final 17 items) | 0.82 | 0.73 | 0.0±1.8 | 0.0±1.2 | 0.0±1.8 | −0.3±0.7 |
| Categories | Difficulty level | Fit residual | χ2 probability | κ agreement | ICF | Origin |
| Pain | −3.3 | −0.9 | 0.77 | 0.6 | b280 | Patient proposal |
| Maintaining a body position | −1.3 | −0.5 | 0.67 | 0.7 | d415 | NHP, DFI, BASFI (adapted) |
| Moving around | −2.8 | −1.1 | 0.2 | 0.8 | d455 | DFI (adapted) |
| Toileting | 1.6 | 1.8 | 0.2 | 0.6 | d530 | RAQoL |
| Energy and drive | −1.9 | −0.3 | 0.4 | 0.8 | b130 | Patient proposal |
| Motivation | −1.2 | 0.2 | 0.3 | 0.7 | b1301 | MSQoL |
| Sexual functions | 0.6 | 0.7 | 0.9 | 0.9 | b640 | Patient proposal |
| Driving | 2.0 | −0.6 | 0.8 | 0.8 | d475 | Patient proposal |
| Community life | 1.8 | −0.8 | 0.7 | 0.8 | d910 | NHP |
| Moving around | 3.3 | 0.7 | 4.7 | 0.7 | d455 | HAQ-S (adapted) |
| Handling stress | 0.1 | −0.4 | 2.1 | 0.7 | d240 | RAQoL |
| Recreation and leisure | 0.4 | −1.5 | 7.2 | 0.7 | d920 | Proposal |
| Emotional functions | −1.2 | −1.5 | 5.3 | 0.8 | b152 | RAQoL, ASQoL |
| Washing oneself | 1.8 | 1.6 | 2.8 | 0.4 | d510 | ASQoL, HAQ (adapted) |
| Economic self-sufficiency | −0.01 | 2.2 | 2.9 | 0.8 | d870 | Environmental Status Scale (adapted) |
| Sleep | −1.2 | 2.1 | 4.9 | 0.8 | b134 | NHP, RAQoL |
| Handling stress | 1.2 | −0.5 | 1.0 | 0.6 | d240 | GHQ (adapted) |
ASAS HI, Assessment of SpondyloArthritis international Society Health Index; ASQol, Ankylosing Spondylitis Quality of Life; BASFI, Bath Ankylosing Spondylitis Functional Index; DFI, Dougados Functional Index; GHQ, General Health Questionnaire; HAQ-S, Health Assessment Questionnaire; ICF, International Classification of Functioning, Disability and Health; MSQoL, Multiple Sclerosis Quality of Life Inventory; NHP, Nottingham Health Profile; RAQoL, Rheumatoid Arthritis Quality of Life.