Table 1. Baseline Clinical Characteristics of Patients with AS.
| Variable | No. of Patients with Available Data | Value |
|---|---|---|
| Age at MRI, year | 52 | 39.2 ± 13.3 (18–74) |
| Male | 52 | 43 (78.2) |
| AS disease duration, month | 52 | 61.8 ± 98.2 (1–456) |
| HLA-B27 positivity | 52 | 42 (80.8) |
| ESR at MRI, mm3/hr | 51 | 37.2 ± 31.4 (1–122) |
| CRP at MRI, mg/dL | 51 | 2.1 ± 2.1 (0.15–8.4) |
| BASDAI at MRI | 42 | 5.2 ± 2.1 (0.2–9.2) |
| BASFI at MRI | 42 | 2.8 ± 2.3 (0.3–9.8) |
| mSASSS at baseline | 50 | 18.8 ± 15.6 (4–68) |
Data presented as mean ± standard deviation (range) for continuous variables and number (%) for categorical variables. AS = ankylosing spondylitis, BASDAI = Bath Ankylosing Spondylitis Disease Activity Index, BASFI = Bath Ankylosing Spondylitis Functional Index, CRP = C-reactive protein, ESR = erythrocyte sedimentation rate, HLA = human leukocyte antigen, MRI = magnetic resonance imaging, mSASSS = modified Stoke Ankylosing Spondylitis Spinal Score