... coefficients of variance for each biomarker were, respectively: for C2C, 10 – 17 % and 14 %; for C1,2C, 5 14 % and 13 %; for CS 846 epitope, 4 12 % and 12 %; and for CPII, 11 18 % and 16 % The interassay coefficients ... Available online http:/ /arthritis- research.com/content/8 /1/ R 31 10 11 12 13 14 15 16 17 18 19 van der Heijde DM: Joint erosions and patients with early rheumatoid arthritis Br J Rheumatol 19 95, 34( Suppl ... arthritis Arthritis Rheum 20 04, 50 :13 90 -13 99 Lohmander LS, Ionescu M, Jugessur H, Poole AR: Changes in joint cartilage aggrecan after knee injury and in osteoarthritis Arthritis Rheum 19 99, 42 :5 34- 544 ...