Figure 3.

NOx/creatinine ratios in urine and serum. Urine and serum samples from 25 patients with active rheumatoid arthritis (RA) and 20 healthy controls (N) were analyzed 72 hours after initiation of a diet low in nitrate and nitrite. NOx/creatinine ratios were calculated and plotted. The difference in serum NOx/creatinine values between the RA and control groups was statistically significant (p = 0.013). The difference between control and RA subjects for urine NOx/creatinine was not statistically significant. NOx, NO₂^- (nitrite) + NO₃^- (nitrate).