Parameters of the structural model corresponding to coefficients of linear regression analyses
| Dependent variable (child node) | Independent variable (parent node) | Regression coefficient with 95% CI |
| BASFI | ASDAS | 1.56 (1.39 to 1.78) |
| ASAS HI | ASDAS | 0.70 (0.30 to 1.11) |
| BASFI | 1.25 (1.04 to 1.40) | |
| BASMI | mSASSS | 0.09 (0.07 to 0.12) |
| BASFI | 0.22 (0.18 to 0.27) |
ASAS HI, Assessment of SpondyloArthritis International Society Health Index; ASDAS, Ankylosing Spondylitis Disease Activity Score based on C-reactive protein; axSpA, axial spondyloarthritis; BASFI, Bath Ankylosing Spondylitis Functional Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score.