Table 2.

Univariate analyses of factors associated with OS and DFS in the training set (n = 245)

Factor	Median OS	P-value	Median DFS	P-value
	Months (95% CI)		(Months)
Pre-operative DM	14.8 (14.2–15.4)	<0.001	10.2 (9.0–11.4)	<0.001
Tumour size ≥ 2 cm	17.0 (15.1–18.9)	0.010	12.4 (10.8–14.0)	0.018
R1 margin	14.6 (12.2–17.0)	<0.001	8.8 (7.4–10.2)	<0.001
Nodal ratio > 0.1	15.8 (14.3–17.3)	<0.001	11.0 (9.8–12.2)	<0.001
BMI ≥ 30 kg/m2	15.8 (13.7–17.9)	0.143	10.5 (9.5–11.5)	0.164

OS, overall survival; DFS, disease-free survival; CI, confidence interval; SD, standard deviation; DM, diabetes mellitus; BMI, body mass index.