Table 1.

Clinical characteristics of patients with resected laryngeal carcinoma

	Total		Training set		Testing set		P value
	2122	%	1485	%	637	%
Age
≤50	269	12.7	206	13.9	63	9.9	.001
(50,65)	1181	55.7	789	53.1	392	61.5
>65	672	31.7	490	33.0	182	28.6
Race
White	1621	76.4	1143	77.0	478	75.0	.052
Black	412	19.4	290	19.5	122	19.2
Other	89	4.2	52	3.5	37	5.8
Sex
Female	400	18.9	283	19.1	117	18.4	.762
Male	1722	81.1	1202	80.9	520	81.6
Year of diagnosis
≤2010	1189	56.0	841	56.6	348	54.6	.417
>2010	933	44.0	644	43.3	289	45.4
Primary location
Supraglottic	1006	47.4	701	47.2	305	47.9	.290
Glottic	810	38.2	556	37.4	254	39.9
Subglottic	88	4.1	65	4.4	23	3.6
Other	218	10.3	163	11.0	55	8.6
Histologic type
Squamous cell	2048	96.5	1432	96.4	616	96.7	.798
Other	74	3.5	53	3.6	21	3.3
Grade
Well	155	7.3	110	7.4	45	7.1	.113
Moderately	1271	59.9	887	59.7	385	60.4
Poorly	677	31.9	480	32.2	197	30.9
Undifferentiated	18	0.8	8	0.5	10	1.6
T classification
T1	141	6.6	98	6.6	43	6.8	.244
T2	266	12.5	182	12.3	84	13.2
T3	554	26.1	372	25.1	182	28.6
T4	1161	54.7	833	56.1	328	51.5
ELNs
Median (range)	40	0‐97	39	0‐97	41	0‐97	.167
MLNR
Median (range)	0.01	0‐1	0.01	0‐1	0.01	0‐1	.106
Treatment
With adjuvant therapy	610	28.7	443	29.8	167	26.2	.094
Without adjuvant therapy	1512	71.3	1042	70.2	470	73.8