Responsiveness analysis of ADC scores in comparison of active group with Group 3. For SPARCC scores, because the SD for Group 3 is zero, no effect size can be calculated.
| Active Mean | Active SD | Group 3 Mean | Group 3 SD | Effect Size | p | |
|---|---|---|---|---|---|---|
| ADC | 0.50 | 0.35 | −0.03 | 0.07 | 7.610 | 10−10 |
| SPARCC | 10.60 | 12.06 | 0.00 | 0.00 | NA | 9.6 × 10−6 |
| ASDAS-CRP | 3.42 | 1.28 | 2.77 | 0.89 | 0.736 | 0.049 |
| ASDAS-ESR | 3.37 | 1.25 | 2.88 | 0.94 | 0.529 | 0.14 |
| ESR | 27.84 | 23.08 | 15.10 | 13.98 | 0.911 | 0.026 |
| CRP | 16.13 | 19.00 | 5.51 | 6.57 | 1.618 | 0.0092 |
| BASDAI | 6.25 | 2.52 | 6.54 | 2.14 | −0.135 | 0.78 |
| BASFI | 4.08 | 2.20 | 4.13 | 2.92 | −0.019 | 0.94 |
| BASMI | 2.33 | 1.81 | 2.11 | 1.96 | 0.112 | 0.78 |
ADC: apparent diffusion coefficient; SPARCC: Spondyloarthritis Research Consortium of Canada; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; ASDAS: Ankylosing Spondylitis Disease Activity Score; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; BASFI: Bath Ankylosing Spondylitis Functional Index; BASMI: Bath Ankylosing Spondylitis Metrology Index.