2. Clinicopathological factors associated with peritoneal dissemination in patients with gastric cancer (Development set, n=1,112).

Variables	Peritoneal dissemination [n (%)]			Univariate analysis		Multivariable analysis
	Positive	Negative		P		OR (95% CI)	P
SRCC, signet-ring cell carcinoma; CEA, carcinoembryonic antigen; OR, odds ratio; 95% CI, 95% confidence interval.
Sex				0.001		1.416 (1.019−1.967)	0.038
Male	146 (58.4)	605 (70.2)
Female	104 (41.6)	257 (29.8)
Age (year)				<0.001		0.597 (0.434−0.821)	0.002
<55	135 (54.0)	311 (36.1)
≥55	115 (46.0)	551 (63.9)
Tumor location				<0.001		1.213 (1.034−1.424)	0.018
Proximal	57 (22.8)	366 (42.5)
Middle	75 (30.0)	154 (17.9)
Distal	113 (45.2)	302 (35.0)
Entire	3 (1.2)	13 (1.5)
Residual	2 (0.8)	27 (3.1)
Tumor size (cm)				<0.001		2.387 (1.718−3.317)	<0.001
≤5	100 (40.0)	555 (64.4)
>5	150 (60.0)	307 (35.6)
Pathological type				<0.001		2.923 (1.968−4.341)	<0.001
SRCC	76 (30.4)	80 (9.3)
Non-SRCC	174 (69.6)	782 (90.7)
Borrmann classification				<0.001		3.210 (1.842−5.594)	<0.001
Borrmann IV	47 (18.8)	43 (5.0)
Non-Borrmann IV	203 (81.2)	819 (95.0)
CEA (ng/mL)				0.093
<5	200 (80.0)	643 (74.6)
≥5	50 (20.0)	219 (25.4)
T stage				0.024		1.592 (1.282−1.977)	<0.001
1	12 (4.8)	74 (8.6)
2	12 (4.8)	78 (9.0)
3	5 (2.0)	16 (1.9)
4	221 (88.4)	694 (80.5)
N stage				<0.001		1.461 (1.288−1.658)	<0.001
0	16 (6.4)	244 (28.3)
1	32 (12.8)	157 (18.2)
2	42 (16.8)	171 (19.8)
3a	143 (57.2)	195 (22.6)
3b	17 (6.8)	95 (11.0)