Table 3.

Factors related to stone residuals

Factor	Variation	n	Univariate analysis
			OR (95% CI)	p-value
Biliary stricture	Yes	16	16.00 (4.01–63.86)	< 0.001
	No	68
Distribution of stones	Intrahepatic	70	7.22 (0.89–58.50)	0.064
	Extrahepatic	14
Shape of stones	Barrel-shaped	4	2.33 (0.31–17.55)	0.410
	Normal shape	80
Number of stones	≥ 3 stones	75	4.00 (0.47–33.78)	0.203
	< 3 stones	9
History of previous surgery	Yes	35	1.04 (0.41–2.65)	0.936
	No	49

OR, odds ratio; CI, confidence interval.