Table 3

Relative risks (odds ratios with 95% confidence intervals, CI) of RF positive RA, RF negative RA, and total RA among tertiles3-150 of serum IgG, IgA, and IgM concentrations

  • 3-150 The tertiles are based on the distribution of concentrations (g/l) among controls. Tertile divisions are, for IgG < 12.21, 12.22-15.00, > 15.00 among men and < 12.97, 12.97-15.33, > 15.33 among women; for IgA < 2.12, 2.12-3.10, > 3.10 among men and < 1.87, 1.87-2.76, > 2.76 among women; and for IgM < 1.06, 1.06-1.52, > 1.52 among men and < 1.57, 1.57-2.41, > 2.41 among women.