Can Biologics Be Discontinued in Patients with Psoriatic Arthritis in Stable Remission? A Prospective Single-CenterClinical and Ultrasound Study

Table 3

Agreement of the two ultrasound methods measured by Cohen’s kappa coefficient.

		CEUS on TP1 (disease relapse)
		No enhancement	Low enhancement	Moderate enhancement	High enhancement
		N (%)	N (%)	N (%)	N (%)
PDUS on TP1 (disease relapse)	No activity	5 (50.0)	4 (40.0)	1 (10.0)	0 (0.0)
	Low activity	0 (0.0)	8 (61.5)	4 (30.8)	1 (7.7)
	Moderate activity	0 (0.0)	1 (5.9)	10 (58.8)	6 (35.3)
	High activity	0 (0.0)	0 (0.0)	0 (0.0)	5 (100.0)

Cohen’ kappa = 0.487, (moderate level of concordance). PDUS, power Doppler ultrasound; CEUS, contrast-enhanced ultrasound.