Table 3.

Classification Criteria for Psoriatic Arthritis (CASPAR) [90]

Symptom domain	Criteriona
Clinical	Established inflammatory articular disease
	Current psoriasis or history of psoriasis (personal or family)
	Dactylitis (current or history)
	Psoriatic nail dystrophy
Radiology	Juxta-articular new bone formation
Serology	Rheumatoid factor negative

^aCASPAR point values: current psoriasis is assigned a score of 2; all other features are assigned a score of 1. To meet the criteria, patients must score at least 3 points from the five categories