Table 3.

Metastasis risk stratification of patients with PTC based on risk scores of nomogram model.

Nomogram	ELR	LR	MR	HR	Total	Total P value	ELR-LR	ELR-MR	ELR-HR	LR-MR	LR-HR	MR-HR
	0-50	51-100	101-150	>150			P value	P value	P value	P value	P value	P value
Training dataset
Without CLNM	90 (87.4%)	128 (70.3%)	66 (37.9%)	27 (17.1%)	311
With CLNM	13 (12.6%)	54 (29.7%)	108 (62.1%)	131 (82.9%)	306	<0.001	0.001	<0.001	<0.001	<0.001	<0.001	<0.001
Total	103	182	174	158	617
Validation dataset
Without CLNM	44 (88.0%)	54 (68.4%)	29 (39.7%)	11 (16.4%)	138
With CLNM	6 (12.0%)	25 (31.6%)	44 (60.3%)	56 (83.6%)	131	<0.001	0.011	<0.001	<0.001	<0.001	<0.001	0.002
Total	50	79	73	67	269

PTC, papillary thyroid carcinoma; CLNM, central lymph node metastasis; ELR, extreme low risk; LR, low risk; MR, moderated risk; HR, high risk.