Table 3.

Baseline characteristics of patients with GRC and PGC before and after propensity score matching

Variable	Unmatched cohort (n = 1440)					Matched cohort (n = 166)
	GRC		PGC		p value	GRC		PGC		p value
	n or median	% or range	n or median	% or range		n or median	% or range	n or median	% or range
Age (year)	67	43	65	75	0.184	67	43	65	45	0.343
Year of surgery	1982	40	1986	42	0.003	1981	40	1985	39	0.002
AJCC/UICC stage					0.018					0.123
IA/B	48	50.5	540	40.8		42	50.6	35	42.2
II	24	25.3	290	21.9		23	27.7	17	20.5
IIIA/B	14	14.7	310	23.4		11	13.3	24	28.9
IV	9	9.5	185	14.0		7	8.4	7	8.4
pT category					0.362					0.183
T1	15	15.8	286	21.3		11	13.3	8	9.6
T2	55	57.9	679	50.5		50	60.2	44	53.0
T3	15	15.8	297	22.1		14	16.9	21	25.3
T4	10	10.5	83	6.2		8	9.6	10	12.0
pN category					0.001					0.485
N0	56	58.9	587	43.7		50	60.2	46	55.4
N1	28	29.5	456	34.0		26	31.3	28	33.7
N2	11	11.6	247	18.4		7	0.4	9	10.8
N3	0	0	53	3.9		0	0	0	0
M category					0.060					1.000
M0	93	97.9	1225	92.5		81	97.6	81	97.6
M1	2	2.1	100	7.5		2	2.4	2	2.4
Resection margins					0.211					1.000
R0	82	86.3	1183	90.4		71	85.5	71	85.5
R+	13	13.7	126	9.6		12	14.5	12	14.5
Type of gastrectomy					< 0.001					1.000
Total	88	92.6	639	47.5		76	91.6	77	92.8
Subtotal	7	7.4	706	52.5		7	8.4	6	7.2
Multivisceral resection	68	71.6	611	46.0	< 0.001	59	71.1	54	65.1	0.506
Signet ring cell carcinoma	17	17.9	365	27.1	0.054	12	14.5	22	26.5	0.083
Postoperative morbidity
Overall complications	36	37.9	361	27.1	0.032	31	37.3	26	31.3	0.513
Major surgical complications	19	20.0	153	11.5	0.021	16	19.3	16	19.3	1.000

p values in bold type indicate statistical significance

AJCC American Joint Committee on Cancer; GRC gastric remnant cancer; PGC primary gastric cancer; UICC Union for International Cancer Control