Table 1

Comparison between US findings and clinical diagnosis

US findings		Clinical diagnosis		Total	p Values
US findings		RA	PsA	Total	p Values
Hypoechoic swelling surrounding the extensor digitorium tendon	Presence	0	54	54	p < 0.001
	Absence	83	28	111
Peri-tendinous power Doppler	Presence	4	50	54	p < 0.001
	Absence	79	32	111
Joint cavity widening	Presence	83	28	111	p < 0.056
	Absence	0	54	54
Synovial fluid	Presence	15	6	21	p < 0.068
	Absence	68	76	144
Synovial hypertrophy	Presence	68	22	90	p < 0.071
	Absence	15	60	75
Intra-articular power Doppler	Presence	72	28	100	p < 0.01
	Absence	11	54	65
Total		83	82	165