Table 4. Predictive factors for R0 resection (n = 377).

	R0 resection (n = 174)	Univariate analysis		Multivariate analysis
		Crude OR (95% CI)	P value	Adjusted OR (95% CI)	P value
Age, n (%)
≥65	93 (42)	0.69 (0.46–1.04)	0.074	0.69 (0.45–1.05)	0.085
<65	81 (52)
Sex, n (%)
Male	129 (46)	0.96 (0.60–1.53)	0.870	0.90 (0.56–1.45)	0.674
Female	45 (47)
Location, n (%)
Left	88 (51)	1.47 (0.98–2.21)	0.066	1.35 (0.88–2.05)	0.165
Right	86 (42)
Size, n (%)
Small	21 (49)	1.13 (0.60–2.13)	0.708	1.12 (0.58–2.14)	0.736
Diminutive	153 (46)
Shape, n (%)
Protruded	75 (45)	0.95 (0.63–1.43)	0.810	1.04 (0.68–1.59)	0.857
Superficial	99 (47)
Endoscopist, n (%)
Non-expert	60 (43)	0.83 (0.54–1.26)	0.373	1.02 (0.65–1.59)	0.945
Expert	114 (48)
NBI-M, n (%)
Yes	42 (58)	1.83 (1.09–3.09)	0.021	1.90 (1.09–3.32)	0.024
No	132 (43)

Abbreviations: OR, odds ratio; CI, confidence interval; NBI-M, narrow-band imaging with magnification.