Table 2

 Diagnostic value of RF, anti-CCP and anti-RA33 autoantibodies. Anti-CCP and anti-RA33 in the subgroup of patients with negative or low titre RF (<50 U/ml)

AutoantibodiesRANon-RA
(n = 56)(n = 94)
Anti-CCP (n)142
Anti-RA33 (n)149
Both antibodies (n)10