Characteristics of the 94 patients examined at followup.
| Characteristics | All 94 Patients | AS*, n = 58 Number or Mean | Psoriasis, n = 17 Number or Mean | |||
|---|---|---|---|---|---|---|
| Number or Mean | Median | Range | Missing Values (No. Patients) | |||
| Women/men | 50/44 | 25/33 | 10/7 | |||
| Age at baseline, yrs | 32.84 | 33 | 15–49 | 33.4 | 36.9 | |
| Age at followup, yrs | 36.6 | 37 | 18–51 | 37.03 | 44.5 | |
| Followup period, mo | 51 | 48 | 25–95 | 48 | 46 | |
| Symptom duration at initial MRI, yrs | 4 | 3 | 0–25 | 4 | 6 | |
| Symptom duration at followup, yrs | 8 | 7 | 3–27 | 8 | 10 | |
| HLA-B27-positive/negative | 55/36 | 3 | 40/17 | 7/9 | ||
| Ankylosing spondylitis at followup* | 58 | 4 | 58 | 6 | ||
| CRP above normal (≥ 75 nmol/l) | 9 | 8 | 7 | 1 | ||
| BASDAI | 3.2 | 2.8 | 0–9 | 14 | 2.9** | 3.1 |
| BASFI | 2.1 | 1.4 | 0–9 | 14 | 1.9** | 1.8 |
| BASMI | 0.4 | 0 | 0–6 | 6 | 0.5*** | 0.4 |
↵* Ankylosing spondylitis according to the modified New York criteria9.
↵** Based on data in 51 patients;
↵*** based on data in 54 patients. MRI: magnetic resonance imaging; CRP: C-reactive protein; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASFI: BAS Functional Index; BASMI: BAS Metrology Index.