Table 1
| Characteristics | Cluster A | Cluster B | Cluster C | Global P+ |
|---|---|---|---|---|
| (n=163) | (n=209) | (n=316) | ||
| Sex (% of men) | 61% | 28% | 49% | <0.0001 |
| Age at onset (≤40 ys) | 76% | 69% | 88% | 0.0027 |
| Duration of symptoms (>24 months) | 31% | 24% | 37% | 0.007 |
| Arthritis (% of yes) | 45% | 95% | 40% | <0.0001 |
| Enthesitis (% of yes) | 40% | 82% | 32% | <0.0001 |
| Dactylitis (% of yes) | 13% | 31% | 2% | <0.0001 |
| Uveitis (% of yes) | 14% | 9% | 5% | 0.003 |
| Psoriasis (% of yes) | 14% | 32% | 7% | <0.0001 |
| IBD* (% of yes) | 1.2% | 4% | 2% | ns |
| HLA-B27+ (% yes) | 61% | 36% | 72% | <0.0001 |
| X Rays sacroiliitis (% of yes) | 16% | 21% | 36% | <0.0001 |
| MRI sacroiliitis (% of yes) | 34% | 24% | 47% | <0.0001 |
| Vascularized PDUS enthesitis° (% of yes) | 15.7% | 23% | 8.5% | 0.004 |
*IBD=inflammatory bowel diseases; °at least one; +Kruskal-Wallis test.