Table 2.

Performance metrics of the NBMs for the vertebral stage determination (70%–30% and 80%–20%)

Model no	Vertebra stage	70%–30%			80%–20%
		Precision	Recall	F1-score	Precision	Recall	F1-score
NBM 1	Stage 1 (S1)	0.47	1.00	0.64	0.50	1.00	0.67
	Stage 2 (S2)	0.09	0.05	0.06	0.00	0.00	0.00
	Stage 3 (S3)	0.33	0.29	0.31	0.25	0.29	0.27
	Stage 4 (S4)	1.00	0.62	0.76	1.00	0.54	0.70
	Stage 5 (S5)	0.83	0.83	0.83	0.78	0.88	0.82
	Stage 6 (S6)	0.90	0.90	0.90	0.92	0.86	0.89
NBM 1 accuracy			0.60			0.60
NBM 1 kappa			0.52			0.51
NBM 2	Stage 1 (S1)	0.47	1.00	0.64	0.50	1.00	0.67
	Stage 2 (S2)	0.25	0.05	0.08	0.00	0.00	0.00
	Stage 3 (S3)	0.61	0.79	0.69	0.55	0.86	0.67
	Stage 4 (S4)	1.00	0.67	0.80	1.00	0.62	0.76
	Stage 5 (S5)	0.83	0.83	0.83	0.78	0.88	0.82
	Stage 6 (S6)	0.90	0.90	0.90	0.92	0.86	0.89
NBM 2 accuracy			0.68			0.67
NBM 2 kappa			0.61			0.60
NBM 3	Stage 1 (S1)	0.49	1.00	0.66	0.50	1.00	0.67
	Stage 2 (S2)	0.10	0.05	0.06	0.00	0.00	0.00
	Stage 3 (S3)	0.38	0.36	0.37	0.38	0.43	0.40
	Stage 4 (S4)	0.93	0.62	0.74	1.00	0.62	0.76
	Stage 5 (S5)	0.75	0.75	0.75	0.75	0.75	0.75
	Stage 6 (S6)	0.90	0.90	0.90	0.86	0.86	0.86
NBM 3 accuracy			0.60			0.61
NBM 3 kappa			0.52			0.53
NBM 4	Stage 1 (S1)	0.48	0.63	0.55	0.53	0.60	0.56
	Stage 2 (S2)	0.00	0.00	0.00	1.00	0.07	0.12
	Stage 3 (S3)	0.26	0.57	0.36	0.15	0.43	0.22
	Stage 4 (S4)	0.59	0.62	0.60	0.53	0.62	0.57
	Stage 5 (S5)	0.50	0.08	0.14	0.50	0.12	0.20
	Stage 6 (S6)	0.80	1.00	0.89	0.82	1.00	0.90
NBM 4 accuracy			0.50			0.50
NBM 4 kappa			0.40			0.40

NBM: Naive Bayes model