Table 4. Classification accuracy of PC-DFA based on Raman data (cross-validation method).

Patient Code	Healthy / disease severity	PC-DFA as Healthy	PC-DFA as Moderate	PC-DFA as Severe
H333	Healthy (20)	19 (95.0%)	1 (5.0%)	0
H372	Healthy (21)	21 (100.0%)	0	0
H438	Healthy (20)	19 (95.0%)	1 (5.0%)	0
H368	Moderate (20)	3 (15.0%)	16 (80.0%)	1 (5.0%)
H369	Moderate (20)	4 (20.0%)	8 (40.0%)	8 (40.0%)
H378	Moderate (20)	0	20 (100.0%)	0
H373	Severe (20)	0	1 (5.0%)	19 (95.0%)
H409	Severe (20)	0	6 (30.0%)	14 (70.0%)
H415	Severe (20)	0	1 (5.0%)	19 (95.0%)
Overall accuracy			85.6%