Table 2.

Permutation test parameters of the OPLS-DA models.

	Column	Ion mode	R2X	R2Y	Q2
MDR-TB/DS-TB group	HILIC	POS	0.550	0.987	0.583
		NEG	0.308	0.856	0.499
	T3	POS	0.428	0.901	0.539
		NEG	0.472	0.895	0.563
MDR-TB/HC group	HILIC	POS	0.394	0.980	0.897
		NEG	0.300	0.886	0.755
	T3	POS	0.234	0.904	0.830
		NEG	0.514	0.934	0.651
DS-TB/HC group	HILIC	POS	0.498	0.982	0.845
		NEG	0.403	0.976	0.781
	T3	POS	0.380	0.952	0.821
		NEG	0.461	0.927	0.651

POS: positive; NEG: negative; R²X: the interpretability of the model for the categorical variable X; R²Y: the interpretability of the model for the categorical variable Y；Q² values: predictability of the model; MDR-TB: multidrug-resistance tuberculosis; DS-TB: drug-sensitive tuberculosis; HC: health control.