Table 3.

Logistic regression analysis of risk factors for a positive margin

Variable	Regression coefficient	Standard error	Odds ratio	95% CI for odds ratio	P value
Serosal invasion	2.300	0.782	9.970	2.152 - 46.196	0.003
Tumor size	1.875	0.787	6.524	1.395 - 30.512	0.017