Table 4.

Sensitivity, specificity, and likelihood ratios for predicting erosions at baseline or at 5 years using baseline RF and anti-CCP status either alone or in combination^*

	Sensitivity, %	Specificity, %	Likelihood ratio
Cross-sectional cohort
All anti-CCP+	45.5	75.2	1.8
Anti-CCP+, RF−	29.6	86.3	2.2
Anti-CCP+, RF+	77.5	38.7	1.3
All RF+	33.1	76.7	1.4
RF+, anti-CCP−	13.6	88.0	1.1
RF+, anti-CCP+	56.4	42.4	1.0
Prospective cohort
All anti-CCP+	54.7	89.4	5.2
Anti-CCP+, in RF−	31.8	94.5	6.0
Anti-CCP+, in RF+	87.8	61.5	2.3
All RF+	40.9	85.2	2.4
RF+, anti-CCP−	11.0	89.1	1.0
RF+, anti-CCP+	65.7	42.3	1.1

^*See Table 1 for definitions.