Table 3.

Risk factors for perforation by univariate analysis

Factor	Odds ratio1 (95%CI)	P value
Age (10 yr increments)	0.96 (0.40-2.32)	0.931
Maximum dimension of lesion (10 mm increments)	1.64 (1.07-2.52)	0.025
Mucosal deficiency (< 75% vs ≥ 75% circumference)	7.93 (1.59-39.7)	0.012
Location (upper + middle vs lower)	1.86 (0.48-7.23)	0.368
Depth of invasion (M vs SM)	3.00 (0.69-12.9)	0.140
Predominant site (right vs left)	2.50 (0.64-9.72)	0.186
Operator (novice vs instructor)	1.13 (0.27-4.69)	0.869

¹Univariate logistic regression analysis. CI: Confidence interval.