Table 2. VIP and AUC values of the metabolites that significantly contribute to the discrimination between the RA and non-RA groups.
| Metabolite | VIP value (rank) | p-valuea | AUCb |
| Metabolites with higher abundances in the RA group than in the non-RA group | |||
| succinate | 2.09 (1) | <0.0001 | 1.000 |
| octadecanol | 2.07 (2) | <0.0001 | 1.000 |
| asparagine | 1.98 (3) | <0.0001 | 1.000 |
| terephthalate | 1.94 (4) | <0.0001 | 1.000 |
| salicylaldehyde | 1.93 (5) | <0.0001 | 1.000 |
| glutamine | 1.92 (6) | <0.0001 | 0.997 |
| citrulline | 1.91 (7) | <0.0001 | 1.000 |
| tyrosine | 1.89 (8) | <0.0001 | 1.000 |
| uracil | 1.87 (9) | <0.0001 | 0.997 |
| lysine | 1.86 (10) | <0.0001 | 0.994 |
| ribitol | 1.72 (12) | <0.0001 | 0.985 |
| tryptophan | 1.59 (17) | <0.0001 | 0.883 |
| xylose | 1.54 (18) | <0.0001 | 0.92 |
| ribose | 1.51 (19) | <0.0001 | 0.969 |
a
p-values were determined using the Wilcoxon-Mann-Whitney test.
b
Area under the receiver operator characteristics curve.