Figure 2.

Serum concentration of NOx. Serum was obtained from 25 patients with active rheumatoid arthritis (RA) and 20 healthy controls (N) at 0, 24, 48, and 72 hours after the initiation of a diet low in nitrate and nitrite. Serum NOx concentrations were higher in the RA group than in the control group at 0, 24, 48, and 72 hours (p = 0.028, 0.0004, 0.046, and 0.053, respectively). Values are expressed as medians (horizontal lines), means (filled circles), interquartile ranges (boxes), and 10th to 90th centile ranges (whiskers). NOx, NO₂^- (nitrite) + NO₃^- (nitrate).