Baseline demographics and disease characteristics. Values are mean (SD) unless otherwise specified.
| Characteristics | Patients With ≥ 1 Enthesitis Site, n = 143 | Patients With 0 Enthesitis Sites, n = 22 | p |
|---|---|---|---|
| Age, yrs | 40.5 (12.0) | 41.0 (12.0) | 0.854 |
| Female, n (%) | 78 (54.5) | 12 (54.5) | 1.000 |
| HLA-B27+, n (%) | 85 (59.4) | 15 (68.2) | 0.641 |
| SpA symptom duration, yrs | 7.2 (7.2)# | 7.3 (7.0) | 0.996 |
| SJC76 ≥ 1, n (%) | 132 (92.3) | 22 (100) | 0.363 |
| SJC76 | 7.0 (7.3) | 4.8 (3.1) | 0.018* |
| TJC78 ≥ 1, n (%) | 141 (98.6) | 22 (100) | 1.000 |
| TJC78 | 14.4 (15.2) | 6.1 (3.8) | < 0.001* |
| Elevated hsCRP, n (%) | 57 (39.9) | 15 (68.2) | 0.020* |
| hsCRP, mg/l† | 8.7 (14.7) | 20.3 (24.5) | 0.040* |
| BASDAI, 0–10 | 5.8 (1.6) | 4.5 (1.4) | < 0.001* |
| BASDAI question 3‡ | 6.7 (1.8) | 6.3 (2.2) | 0.417 |
| BASDAI question 4§ | 6.2 (2.3) | 5.3 (2.3) | 0.105 |
↵* p ≤ 0.05 for patients with versus without ≥ 1 enthesitis site at baseline.
↵# n = 139.
↵† Upper limit of normal = 5 mg/l.
↵‡ How would you describe the overall level of pain/swelling in joints, other than neck, back, or hips, you have had?
↵§ How would you describe the overall level of discomfort you have had from any areas tender to touch or pressure? SpA: spondyloarthritis; SJC: swollen joint count; TJC: tender joint count; hsCRP: high-sensitivity C-reactive protein; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index.