Patient characteristics
| Characteristics | Description |
| No of patients, male/female, n | 23/5 |
| Median age at study entry, years (range) | 38.5 (24–62) |
| Median onset of disease, years (range) | 27 (8–57) |
| Median duration of disease, years (range) | 10.4 (2–29) |
| HLA B27 positive/negative/unknown not determined, n | 17/7/4 |
| Time intervals of infliximab infusions before MRI assessment, median, weeks (range) | 6 (4–12) |
| Median dose of infliximab, mg/kg body weight (range) | 4.45 (3–6) |
| Regular NSAID intake, n | 1 |
| Concomitant DMARD therapy, n | 15 |
DMARD, disease-modifying antirheumatic drug; MRI, magnetic resonance imaging; NSAID, non-steroidal anti-inflammatory drug.