Table 3

 Rheumatoid factor and anti-cyclic citrullinated peptides levels in patients with extra-articular rheumatoid arthritis, individual extra-articular rheumatoid arthritis manifestations and controls with rheumatoid arthritis

nRF (IU/ml)Anti-CCP (U/ml)
MedianIQRMedianIQR
CCP, cyclic citrullinated peptides; ExRA, extra-articular rheumatoid arthritis; IQR, interquartile range; ND, not detected; RA, rheumatoid arthritis; RF, rheumatoid factor.
ExRA3524594–60442776–1516
Major cutaneous vasculitis9413150–14501171458–1420
Felty’s syndrome5299117–104380871999–14686
Neuropathy415843–1026663129–1087
Pericarditis1027583–35933964–1769
Pleuritis1015535–49487ND-271
Controls with RA7073ND-165169ND-1133