Table 1.

Univariate logistic regression analysis of the training data set.

		OR	95% CI	P-value
Age		0.79	0.47–1.42	0.41
Gender	Female	Ref
	Male	0.38	0.26–0.56	<0.0001
Size of liver	Normal	Ref
	Enlargement	1.57	1.09–2.24	0.013
Fasting gallbladder visibility	No	Ref
	Yes	0.19	0.09–0.34	<0.0001
Fasting gallbladder filling	No	Ref
	Poor	0.78	0.49–1.26	0.30
	Generally filled	0.44	0.28–0.70	<0.00048
	Well-filled	0.14	0.08–0.24	<0.0001
Common bile duct visibility	Invisible	Ref
	Unclear	3.17	1.11–13.35	0.060
	Fine	0.63	0.42–0.94	0.026
	Normal	0.27	0.16–0.47	<0.0001
log(weight)		1.02	0.51–2.04	0.96
log(ALB)		1.26	0.82–2.07	0.33
log(ALP)		0.57	0.38–0.81	0.0029
log(AST)		0.89	0.70–1.11	0.33
log(DBIL)		2.01	1.33–3.12	0.0012
log(GGT)		3.37	2.71–4.24	<0.0001
log(GLB)		1.24	0.62–2.48	0.54
log(TBA)		1.32	0.91–1.89	0.13
log(TBIL)		2.15	1.27–3.69	0.0045

OR, odds ratio; Ci, confidential interval; Ref, reference.