The ClASsification for Psoriatic ARthritis (CASPAR) Criteria – A Retrospective Feasibility, Sensitivity, and Specificity Study

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Table 1.

Demographic data of the study group.

Characteristic	Psoriatic Arthritis, mean (SD)	Control Group, n = 115, mean (SD)
Age, yrs (n = 456)	57.4 (13.2)	65 ± 14.1
Age at onset of arthritis, yrs (n = 456)	39.5 (13.8)	56.8 ± 14.4
Age at onset of psoriasis, yrs (n = 456)	30.3 (15.4)	NA
Female, %	53.1	73
Rheumatoid factor-positive, % (n = 416)	2.9	64
Cyclic citrullinated antibody-positive, % (n = 363)	1.3	43
Phenotype, % (n = 316)
Distal interphalangeal (DIP)	0.3
DIP and polyarthritis	0.3
Monoarthritis	1.7
Mutilans	1.9
Oligoarthritis	22
Oligoarthritis and spondyloarthritis	3.9
Polyarthritis	59.4
Polyarthritis and spondyloarthritis	8.5
Spondyloarthritis	1.9