Table 4.

Multivariate analysis of risk factors for adverse events considering age ≥ 80, Charlson Comorbidity Index ≥ 2, difficult cannulation, ampullary carcinoma, and needle knife precut

	Adjusted odds ratio	95% Confidence interval		P value
		Lower	Upper
Adverse events
Age ≥ 80	1.568	0.861	2.854	0.141
CCI ≥ 2	1.824	0.993	3.349	0.045
Difficult cannulation	3.478	1.877	6.442	< 0.001
Ampullary carcinoma	0.551	0.116	2.610	0.453
NKP	0.506	0.229	1.121	0.093

CCI: Charlson Comorbidity Index; NKP: Needle knife precut.