TABLE 2.

Univariate and multivariate analysis of postoperative complications.

Factors	Training group			Validation group
	Univariate analysis		Multi- analysis c value	Univariate analysis		Multi- analysis P-value
	OR (95%CI)	P-value		OR (95%CI)	P-value
Radiomic sarcopenia	3.3 (1.8, 6.0)	<0.001	0.003*	3.6 (2.0, 6.5)	<0.001	<0.001*
Gender		0.197			0.767
Female	Ref			Ref
Male	0.7 (0.3, 1.2)	0.197		0.9 (0.5, 1.7)	0.767
Age > 65 years	2.3 (1.3, 4.1)	0.006	0.142	1.9 (1.0, 3.4)	0.037	0.135
BMI < 18.5 kg/m2	1.8 (0.7, 4.5)	0.198		2.7 (1.1, 6.6)	0.028	0.622
NRS-2002 score		0.106			<0.001	0.013*
1–2	Ref			Ref
3–4	1.3 (0.7, 2.5)	0.39		2.6 (1.4, 4.9)	0.026	0.005
5	2.8 (1.0, 7.5)	0.04		4.8 (1.5, 15.2)	0.079	0.112
Laparoscopic surgery	0.8 (0.4, 1.4)	0.018	0.032*	0.8 (0.4, 1.4)	0.397
Total gastric resection	1.6 (0.9, 2.8)	0.135		1.8 (1.0, 3.2)	0.040	0.762
Combined resection	2.7 (1.2, 6.2)	0.015	0.124	6.1 (2.5, 14.6)	< 0.001	<0.001*
Anastomotic type		0.007	0.177		0.013	0.028*
Roux-en-Y	Ref			Ref
Billroth I	0.5 (0.2, 0.9)	0.025	0.154	0.6 (0.3, 1.1)	0.093	0.316
Billroth II	1.7 (0.8, 3.8)	0.162	0.450	0.3 (0.1, 0.7)	0.008	0.010
TNM stage		0.173			0.007	0.050*
I	Ref			Ref
II	1.5 (0.6, 3.5)	0.393		3.3 (1.5, 7.5)	0.004	0.015
III	1.9 (1.0, 3.8)	0.065		2.5 (1.2, 5.1)	0.011	0.182

BMI, body mass index; NRS-2002, nutritional risk screening; TNM, tumor–node–metastasis; OR, odds ratio; CI, confidence interval; ref, reference.

*Statistically significant in multivariate analysis.