Table 2.

The fitting parameters of OPLS-DA model.

Group	HS-SPME		SAFE
	R2 (%)	Q2 (%)	R2 (%)	Q2 (%)
T-GS_vs_T-G1	96.42	99.6	75	94.5
T-GS_vs_T-G2	94.19	99.1	84.2	98.3
T-G1_vs_T-G2	85.3	99.3	76	91.3
M-GS_vs_M-G1	84.5	99.2	85.5	99.2
M-GS_vs_M-G2	86.2	98.7	82.8	98.8
M-G1_vs_M-G2	71.1	95.4	77.9	89.8