The values for methionine metabolites measured in the sera of the recurrent-free and the recurrent groups are compared.

Wilcoxon rank sum tests for continuous variables and Fisher exact tests for categorical (including binary) variables are indicated. Normal values for metabolites are: cysteine, 203–369 µM homocysteine, 5.4–13.9 µM; dimethylglycine, 1.4–5.3 µM; sarcosine, 0.6–2.7 µM; methionine, 11.3–42.7 µM; folate, >3.0 ng/ml; methylcitrate, 60–228 nM; methylmalonate, 73–271 nM; cystathionine, 44–342 nM. Median values with quartiles were used to summarize the distributions of the continuous variables.