Univariate logistic regressions regarding disease-related factors. P value compares patients with “low fatigue” against “high fatigue.” Percentages indicate no. patients with the covariate from the total no. patients in the category of fatigue. Values are n (%) unless otherwise specified.
| Total | Low Fatigue, ≤ 5 | High Fatigue, > 5 | OR (95% CI) | p | |
|---|---|---|---|---|---|
| Clinical forms | |||||
| Peripheral | 382 (17.21) | 268 (19.13) | 114 (13.92) | Reference | |
| Nonradiographic axial | 207 (9.32) | 131 (9.35) | 76 (9.28) | 1.36 (0.95–1.95) | 0.089 |
| Radiographic axial | 1631 (73.47) | 1002 (71.5) | 629 (76.80) | 1.47 (1.16–1.87) | 0.001 |
| Inflammatory back pain | 1840 (81.85) | 1131 (79.7) | 709 (85.42) | 1.48 (1.18–1.87) | < 0.001 |
| HLA-B27+ | 1396 (73.86) | 886 (74.89) | 510 (72.14) | 0.87 (0.70–1.07) | 0.186 |
| NSAID response | 891 (93.01) | 578 (93.78) | 313 (92.33) | 0.85 (0.51–1.42) | 0.544 |
| BASRI, mean (DS) | 5.35 (4.33) | 5.28 (4.36) | 5.46 (4.27) | 1.01 (0.99–1.03) | 0.364 |
NSAID: nonsteroidal antiinflammatory drugs; BASRI: Bath Ankylosing Spondylitis Radiographic Index.