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

Values for sarcosine, homocysteine, dimethylglycine and cysteine are expressed as µmoles/mg creatinine. Wilcoxon rank sum tests for continuous variables and Fisher exact tests for categorical (including binary) variables are indicated. Normal values for metabolites (nmole/mg creatinine) are: cysteine, 140–579; homocysteine, 0.974–7.17; dimethylglycine, 10.1–108.2 and sarcosine, 2.65–8.67. Median values with quartiles were used to summarize the distributions of the continuous variables.