Table 4.

Enthesitis by PDUS according to ASAS criteriafor axial spondyloarthritis

PDUS examination N=402	ASAS+ N=288		ASAS– N=109
	Radiographic/MRI sacroiliitis N=189	HLA-B27 and 2 other clinical features N=96	CRP <6 mg/L N=19	CRP >6 mg/L N=87
	MD=3		MD=0	MD=3
PDUS enthesitis N=58 (58/402=14.4%)	ASAS+ N=40		ASAS–N=18
	Radiographic/MRI sacroiliitis N=29 (29/186=10.1%)	HLA-B27 and 2 other clinical features N=10 (10/95=10.5%)	CRP <6 mg/L N=3 (3/19=15.8%)	CRP >6 mg/L N=14 (14/87=16.1%)
	MD=3	MD=1	MD= 0	MD=1

ASAS, Assessment of SpondyloArthritis international Society; CRP, C reactive protein; MD, missing data; PDUS, power Doppler ultrasonography.