% SELF ANTIGEN
BK AII VEGF bFGF
Reproducibility 96 97 90 90
Sensitivity        
primary kOA 26
13
23 8
secondary kOA 17 8 5 3
Specificity 96 95 93 91
Table 2: Reproducibility, sensitivity and specificity of detection of natural IgG antibodies in osteoarthritis of the knee.