Table 2.

Confusion matrix of machine learning combined feature score converted to an ordinal scale compared with the modified Marsh type

		Machine Learning Scorea
		0	1	2	3a	3b	3c
Modified Marsh Score	0	16	20	6	0	0	0
	1	2	4	4	0	0	0
	2	0	0	1	1	0	0
	3a	1	4	9	6	2	1
	3b	0	2	13	11	4	7
	3c	0	0	0	0	0	2

^aThe machine learning score was converted to an ordinal scale by assigning the closest number, using values of 3.0/3.333/3.666 for scores of 3a/3b/3c respectively