Demographic and biometrics characteristics
| Characteristics | Value |
| Median age (IQR) | 53 (43.8–61.5) |
| Sex, n (%)—male | 12 (60) |
| Smokers, n (%) | 4 (20) |
| Family history of RD/IBD, n (%) | 3 (15) |
| Years of illness (years) | 14.5 (1–38) |
| Arthritis, n (%)—PsA | 1 (5) |
| Arthritis, n (%)—AS | 8 (40) |
| Arthritis, n (%)—SpA | 11 (55) |
| Axial, n (%) | 10 (50) |
| Peripheral, n (%) | 12 (60) |
| IBD, n (%)—Crohn’s | 17 (85) |
| IBD, n (%)—UC | 3 (15) |
| Skin involvement, n (%) | 4 (20) |
| Eye involvement, n (%) | 6 (30) |
| HLA-B27, n (%) | 3 (15) |
| Endoscopic score, n (%)—1 | 2 (10) |
| Endoscopic score, n (%)—2 | 13 (65) |
| Endoscopic score, n (%)—3 | 5 (25) |
| Gut localisation, n (%)—E3 | 2 (10) |
| Gut localisation, n (%)—L1 | 8 (40) |
| Gut localisation, n (%)—L2 | 3 (15) |
| Gut localisation, n (%)—L3 | 6 (30) |
| Gut localisation n (%)—L4 | 1 (5) |
AS, Ankylosing Spondylitis; IBD, inflammatory bowel diseases; PsA, Psoriatic Arthritis; RD, Rheumatic Disease; SpA, spondyloarthritis; UC, ulcerative colitis.