Table 2.

Association of physical examination assessment of MCP joints (dichotomized) with MRI synovitis, erosion, and edema scores (dichotomized) in subjects with RA and PsA.

Examination Measurement	Statistic	MRI Measurement
		RA			PsA
		Synovitis	Erosion	Edema	Synovitis	Erosion	Edema
2-finger	p	0.64	0.32	0.54	0.53	0.53	0.68
	Sensitivity	0.44	0.44	0.53	0.49	0.49	0.48
	Specificity	0.63	0.44	0.55	0.58	0.58	0.58
	PPV	0.67	0.44	0.64	0.39	0.39	0.43
	NPV	0.40	0.44	0.44	0.68	0.68	0.63
4-finger	p	0.65	0.32	0.54	0.39	0.67	1.0
	Sensitivity	0.46	0.46	0.55	0.43	0.40	0.38
	Specificity	0.60	0.42	0.53	0.66	0.65	0.63
	PPV	0.66	0.44	0.63	0.41	0.38	0.41
	NPV	0.40	0.44	0.44	0.68	0.67	0.60
Stress	p	<0.01	0.82	0.02	0.41	0.01	0.04
	Sensitivity	0.28	0.28	0.55	0.54	0.26	0.35
	Specificity	0.97	0.76	0.88	0.55	0.40	0.43
	PPV	0.93	0.54	0.81	0.40	0.19	0.29
	NPV	0.45	0.51	0.47	0.69	0.50	0.50
TJC	p	<0.01	0.03	0.08	<0.01	0.83	0.84
	Sensitivity	0.32	0.32	0.28	0.74	0.49	0.53
	Specificity	1.0	0.88	0.88	0.62	0.48	0.50
	PPV	1.0	0.73	0.77	0.51	0.33	0.41
	NPV	0.47	0.56	0.45	0.82	0.63	0.61
Visual at-rest	p	0.02	0.84	0.07	0.40	0.83	0.5
	Sensitivity	0.48	0.48	0.58	0.49	0.40	0.38
	Specificity	0.80	0.48	0.63	0.62	0.57	0.55
	PPV	0.80	0.48	0.70	0.40	0.33	0.36
	NPV	0.48	0.48	0.50	0.69	0.64	0.57

MCP: metacarpophalangeal joints; MRI: magnetic resonance imaging; RA: rheumatoid arthritis; PsA: psoriatic arthritis; PPV: positive predictive value; NPV: negative predictive value; TJC: tender joint count.