Table 2

 Autoantibodies in patients with extra-articular rheumatoid arthritis versus controls without extra-articular rheumatoid arthritis

ExRANon-ExRAp Value
ANA, antinuclear antibodies; CCP, cyclic citrullinated peptides; ExRA, extra-articular rheumatoid arthritis; RF, rheumatoid factor.
Anti-CCP positive (>50 U/ml)27/35 (77%)39/70 (56%)0.03
RF positive (>20 U/ml)33/35 (94%)49/69 (71%)0.006
ANA positive13/35 (37%)26/68 (38%)0.91
Previously RF positive (ever)30/35 (86%)33/69 (52%)<0.001
Previously ANA positive (ever)17/32 (53%)23/66 (35%)0.08