Table 4.

Variables selected after backward selection for the prediction model for disease recurrence

Clinicopathological factors	Multivariate analysis OR (95% CI), p value	OR min max Imputed data set (n = 20 × 558)
Resection margin, mm
>0	1.00 (ref)
0	2.84 (1.39–5.79), 0.004	2.19–4.10
Lymphatic invasion
No	1.00 (ref)	2.77–4.98
Yes	3.34 (1.67–6.68), 0.0007
Intramural venous invasion
No	1.00 (ref)
Yes	3.12 (1.52–6.42), 0.002	2.21–4.27