Table 1

 Moll and Wright subgroups applied to the current (classification of psoriatic arthritis) dataset

PsA, n = 588RA, n = 384
n%n%
DIPJ, distal interphalangeal joint; NA, not applicable; PsA, psoriatic arthritis; RA, rheumatoid arthritis.
Not defined1931<1
Arthritis mutilans16351
DIPJ predominant2340NA
Oligoarthritis7613205
Polyarthritis3726335893
Spinal involvement82140NA