Psoriatic arthritis (PsA) subsets in the two treatment patient groups
| bDMARDs | Phototherapy | P value | |
| Incident PsA (any type), n (%) | 19 (8) | 32 (14) | 0.046 |
| Peripheral arthritis, n (%) | 16 (7) | 27 (12) | 0.003 |
| Axial arthritis, n (%) | 1 (0) | 2 (1) | 0.712 |
| Dactylitis, n (%) | 2 (1) | 7 (3) | 0.361 |
| Enthesitis, n (%) | 3 (1) | 7 (3) | 0.361 |
| Swollen joint, n | 2.61±0.40 | 3.21±0.62 | 0.417 |
| Painful joints, n | 2.34±0.38 | 2.95±0.64 | 0.424 |
Continuous and categorical variables are presented as mean±SD and proportion, respectively.
*Unpaired t-test for quantitative variables; χ2 test for qualitative variables
bDMARDs, biological disease-modifying antirheumatic drugs.