Table 3. Combined PLS-DA Cross-Validation Models’ Accuracies on Identifying the Specific Colorant Group between Both Environments.

group (LVs)	model accuracy (%)	predicted as chlorine-exposed; accuracy (%)	predicted as nonchlorine exposed; accuracy (%)
week 1 (8)	99.8	99.8	99.8
week 2 (8)	100	100	100
week 3 (8)	99.2	99.2	99.2
week 4 (7)	100	100	100
week 5 (8)	100	100	100
week 6 (5)	99.8	99.8	99.8
week 7 (6)	100	100	100
week 8 (7)	100	100	100