Table 1 Demographic features of different cohorts
| AS alone | AS-IBD | MBP | IBD | HC | |
|---|---|---|---|---|---|
| N (male/female) | 462 (350/112) | 57 (44/13) | 52 (26/26) | 85 (85/0) | 158 (106/52) |
| HLA-B27 positivity | 78% (357/456) | 56% (32/57) | 0% (0/52) | N/A | 0% (0/158) |
| CRP (mg/L) | 13.9 ± 21.1 | 15.4 ± 17.3 | 2.13 ± 2.8 | N/A | N/A |
| ESR (mm/hour) | 13.5 ± 15.6 | 14.4 ± 17.2 | 6.2 ± 4.9 | N/A | N/A |
| BASDAI | 4.8 ± 2.5 | 4.5 ± 2.6 | 4.8 ± 2 | N/A | N/A |
| Biologics* | 43% (200/462) | 74% (42/57) | N/A | N/A | N/A |
| Disease duration (years) | 2–62 | 2–53 | N/A | N/A | N/A |