Table 11. PLS-DA Models for Calibration by the Age Group of Dyed Hair (DH) and Undyed Hair (UH) FT-IR Spectra.

DH FT-IR		actual age group			UH FT-IR	actual age group
predicted age group	accuracy, %	20–25 (n = 72)	30–35 (n = 36)	43 (n = 12)	accuracy, %	20–25 (n = 72)	30–35 (n = 36)	43 (n = 12)
20–25	63.9	46	6	3	95.8	69	3	0
30–36	75.0	17	27	3	88.9	3	32	0
43	50.0	9	3	6	100	0	1	12