Table 2.

Distinct metabolites in population with arsenic-induced skin lesions and their counterparts

Serum amino acid metabolites	Retention time (min)	Mass-to- charge ratio	VIP value	P values*	Adjusted p values†
Phenylalanine	3.402	166.087	1.508	<0.001	0.009
Tryptophan	3.886	203.082	1.046	0.003	0.014
Leucine	2.642	132.102	1.014	0.001	0.020
Phenylalanylphenylalanine	5.048	313.155	1.833	0.004	0.033

*Wilcoxon signed-rank test

†Adjusted by false discovery rate.

VIP, variable importance in the projection.