Table 3.

Distribution profiles of the clinicopathologic factors of the patients in the SRR and ISRR groups before and after PSM matching

Characteristics	Cases (%) 2562	Before PSM			After PSM
		SRR (n = 1064)	ISSR (n = 1588)	P value	SSR (n = 1024)	ISRR (n = 1024)	P value
Age, years				< 0.001			1.0
≤ 60	1422	627	795		589	589
> 60	1230	437	793		435	435
Sex				0.477			0.757
Male	1356	553	803		535	528
Female	1296	511	785		489	496
Race				0.261			0.230
White	2296	919	1377		882	884
Black	297	115	182		112	123
Others	42	23	19		23	12
Unknown	17	7	10		7	5
Primary location				< 0.001			1
Jejunum	215	40	175		39	39
Ileum	2437	1024	1413		985	985
Tumor size, cm	19.1 ± 12.2	19.1 ± 12.4	19.1 ± 12.0	0.595	19.2 ± 12.6	19.5 ± 12.7	0.659
Histologic typea				0.897			0.456
8240	2038	813	1225		787	780
8246	544	223	321		211	225
8249	70	28	42		26	19
Surgery type				0.001			1.0
Simple resection	1676	630	1046		629	629
Partial resection	650	282	368		267	267
Total resection	326	152	174		128	128
Tumor differentiation				< 0.001			1.0
Well	1571	684	887		660	660
Moderate	385	157	228		143	143
Poor	23	6	17		6	6
Undifferentiated	2	2	0		0	0
Unknown	671	215	456		215	215
PLNs	3.10 + 3.23	3.71 + 3.24	2.69 + 3.16	< 0.001	3.74 + 3.27	2.72 + 3.19	< 0.001
AJCC T status				0.158			0.389
T1	364	160	204		153	143
T2	679	286	394		275	247
T3	1068	407	661		388	413
T4	541	212	329		208	221

AJCC American Joint Committee on Cancer, SRR sufficiently radical group, ISRR insufficiently radical group, PSM propensity score matching

^aInternational Classification of Diseases for Oncology, 3rd Edition (ICD-O-3): 8240, Carcinoid tumor; 8246, Carcinoid carcinoma; 8153, Gastrinoma; 8249, Atypical carcinoid tumor