| Shared epitope | UIA n = 1621 | PsA cases | Population controls n = 537 | ||
| Whole cohort n = 467 | Type I n = 344 | Type II n = 120 | |||
| 0 | 634 (39.1) | 256 (54.8) | 197 (57.3) | 59 (49.2) | 293 (54.6) |
| 1 | 740 (45.7) | 184 (39.4) | 126 (36.6) | 55 (45.8) | 203 (37.8) |
| 2 | 247 (15.2) | 27 (5.8) | 21 (6.1) | 6 (5.0) | 41 (7.6) |
| Phenotype | 987 (60.9) | 211 (45.2) | 147 (42.7) | 61 (50.8) | 244 (45.4) |
| p Value* | 3.63×10−10 | 0.94 | 0.43 | 0.28 | |
UIA, early undifferentiated inflammatory arthritis; PsA, psoriatic arthritis; type I, patients with PsA with type I psoriasis; type II, patients with PsA with type II psoriasis.
*Comparison of phenotype (carriage of one or two alleles) with population controls.
Data shown in n (%) unless stated otherwise.