Table 3. Logistic regression analyses of risk factors for serosal invasion, node-positive and late stage patients in gastric cancer, respectively.

Characteristics	Serosal invasion				LN metastasis				TNM stage
	RR	95% CI	P		RR	95% CI	P		RR	95% CI	P
Age (<60 vs. ≥60 years)	0.458	0.266 to 0.789	0.005		0.925	0.526 to 1.627	NS		0.557	0.276 to 1.123	NS
Location (U/W vs. M/L)	1.841	0.876 to 3.871	NS		0.620	0.308 to 1.247	NS		1.972	0.723 to 5.380	NS
Tumor size (>3 vs. ≤3 cm)	9.718	5.428 to 17.396	0.000		3.051	1.626 to 5.725	0.001		6.302	3.173 to 12.514	0.000
Differentiation (differentiated vs. undifferentiated)	0.481	0.281 to 0.823	0.008		0.446	0.253 to 0.785	0.005		0.446	0.219 to 0.905	0.025
HDL-C (≥54.2 vs. <54.2 mg/dL)	1.808	1.038 to 3.151	0.037		2.481	1.398 to 4.404	0.002		2.544	1.254 to 5.161	0.010
Serosal invasion (no vs. yes)	–	–	–		0.194	0.107 to 0.352	0.000		0.203	0.132 to 0.313	0.000
LN metastasis (no vs. yes)	–	–	–		–	–	–		0.203	0.132 to 0.313	0.000

U/W, upper/whole body; M/L, middle/lower body; RR, risk ratio; CI, confidence interval; NS, no significant.