Table 4.

Logistic regression analysis of the strength of association of different antibody levels.

Antibody	Comparison	B	P	OR (95% CI)
anti-CCP or RF	low vs negative	1.6	1.3 × 10−18	5.1 (3.5–7.3)
anti-CCP or RF	high vs negative	3.6	3.2 × 10−30	36.4 (19.6–67.3)
anti-CarP	low vs negative	1.4	2.4 × 10−11	3.9 (2.6–5.8)
anti-CarP	high vs negative	2.0	1.1 × 10−17	7.1 (4.5–11.1)

Each antibody category was analyzed separately with age, sex and EAC as covariates. Low and high categories were defined in relation with the median of the positives.