Table 3. Risk factors for in-hospital mortality in octogenarians undergoing ERCP.

	Univariate analysis				Multiple variable analysis
Variable	OR	95 % CI Lower	95 % CI Upper	p-value	OR	95 % CI Lower	95 % CI Upper	P value
Age1	1.05	0.997	1.096	0.0674	1.050	1.001	1.101	0.0463
Male sex	1.207	0.984	1.481	0.0717	0.870	0.706	1.071	0.1879
More than 2 comorbidities2	2.447	1.868	3.206	< 0.001	1.446	1.285	1.626	< 0.001
Race, non-white	1.174	0.911	1.513	0.2145
Hospital size
Small	ref
Medium	1.162	0.731	1.845	1.162
Large	1.218	0.791	1.874	0.426
Non-teaching hospital	0.772	0.631	0.944	0.0117	0.787	0.641	0.966	0.0218
Region
West	ref
Northeast	0.993	0.736	1.340	0.9646
Midwest	0.825	0.611	1.114	0.2086
South	0.942	0.720	1.232	0.6618
Rural hospital	1.002	0.706	1.421	0.9932
Admission source, emergency department	0.954	0.669	1.361	0.7952
Admission type
Urgent or emergent	ref				ref
Elective	0.642	0.423	0.976	0.038	0.748	0.483	1.157	0.1919
Any stone disease	0.533	0.433	0.656	< 0.001	0.571	0.441	0.739	< 0.001
Any infection	3.329	2.649	4.184	< 0.001	3.105	2.523	4.070	< 0.001
Any malignancy	1.616	1.320	1.977	< 0.001	1.28	1.005	1.629	0.00453
Any pancreatitis	0.751	0.571	0.988	0.0405	0.960	0.723	1.274	0.7771

¹For each additional year.

²Defined by Elixhauser comorbidity algorithm ^{13 14}