| Characteristics | PsA probands | FDRs with PsA |
| Male/female | 50/50 | 13/9 |
| Age (years) | 39 | 51 |
| PsA duration (years) | 6 | 12 |
| Age at onset of psoriasis (years) | 28 | 31 |
| Age at onset of PsA (years) | 33 | 39 |
| Actively inflamed joint count* | 12 | 3 |
| Swollen joint count | 5 | 1 |
| Clinically damaged joint count | 2 | 2 |
| Radiographic damage score† | 4 | 3 |
| Radiographic sacroiliitis (at least Grade 2)‡ | 36% | 58% |
| Psoriasis Area and Severity Index score | 4 | 3.5 |
*Number of tender and/or swollen joints.
†According to the modified Steinbrocker method.
‡According to the modified New York criteria.
FDRs, first-degree relatives; PsA, psoriatic arthritis.