Table 5. Effect of early ERCP on LOS in gallstone-related pancreatitis.

				% change in LOS when ERCP was done early
	Univariate regression coefficient (95 %)	S.E.	P value	Multivariate regression coefficient (95 %CI)	S.E.	P value
ERCP > Day 1	Ref		NA	Ref		NA
ERCP ≤ Day 0–1	–0.44 (–0.46–0.43)	.006	< 0.001	–0.39 (–0.40–0.38)	.006	< 0.001
Age	0.01 (0.01 0.01)	.000	< 0.001	0.00 (0.00 0.00)	.000	0.004
Severe pancreatitis	0.69 (0.68 0.70)	.006	< 0.001	0.52 (0.51 0.55)	.010	< 0.001
Elixhauser Index	0.10 (0.10 0.11)	.000	< 0.001	0.06 (0.06 0.06)	.002	< 0.001

ERCP, endoscopic retrograde cholangiopancreatography; LOS, length of stay; S.E., standard error.