Baseline characteristics of 68 patients with chronic inflammatory low back pain
| Characteristic | All patients (n = 68) |
|---|---|
| *45 of the 47 patients who were asked about night pain. | |
| AS, ankylosing spondylitis; ESSG, European Spondylarthropathy Study Group; IBD, inflammatory bowel disease; IQR, interquartile range. | |
| Sex (% male) | 38 |
| Age (years) (mean (SD)) | 34.9 (10.3) |
| Symptom duration (months) (median (IQR)) | 18.0 (12.0 to 24.0) |
| Criteria for inflammatory low back pain: | |
| 3 criteria present | 56% |
| 4 criteria present | 41% |
| 5 criteria present | 3% |
| Night pain present | 96%* |
| HLA-B27 present | 46% |
| History of IBD present | 15% |
| History of uveitis present | 15% |
| History of psoriasis present | 24% |
| Family history of AS present | 37% |
| Fulfilling ESSG criteria | 84% |
| Fulfilling Amor criteria | 71% |
| Fulfilling both ESSG and Amor criteria | 63% |