Long-term stability of anti-cyclic citrullinated peptide antibody status in patients with early inflammatory polyarthritis

Table 3 Sensitivity, specificity and likelihood ratios for presence of radiographic damage and functional disability at 5 years according to baseline and 5-year autoantibody status

Autoantibody status	Erosions				Larsen score > 15				HAQ ≥ 1
	Sensitivity	Specificity	Accuracy	LR	Sensitivity	Specificity	Accuracy	LR	Sensitivity	Specificity	Accuracy	LR
Anti-CCP⁺
Baseline	0.56	0.89	0.74	5.0	0.65	0.85	0.79	4.3	0.41	0.78	0.61	1.8
Year 5	0.56	0.89	0.75	5.1	0.66	0.86	0.79	4.5	0.41	0.78	0.61	1.8
Base or Year 5	0.59	0.88	0.75	5.1	0.69	0.85	0.79	4.5	0.43	0.77	0.62	1.8
RF ⁺
Baseline	0.44	0.84	0.67	2.8	0.50	0.82	0.71	2.7	0.36	0.77	0.59	1.6
Year 5	0.40	0.84	0.65	2.5	0.42	0.81	0.68	2.2	0.36	0.82	0.61	1.9
Base or Year 5	0.54	0.76	0.67	2.3	0.60	0.74	0.69	2.3	0.45	0.72	0.60	1.6

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