Table 4.

Multivariate analysis of contributing factors to successful or unsuccessful stone extraction.

	OR	95% CI	P value
Age	1.779	1.110–2.850	0.017
Periampullary diverticula	0.684	0.452–1.034	NS
Multiple stones	1.647	1.060–2.559	0.026
Diameter of CBD stones > 15 mm	1.804	1.210–2.691	0.004

OR: odds ratio, NS: not significant.