Biliary drainage strategy of unresectable malignant hilar strictures by computed tomography volumetry

Table 2 Predictors of initial drainage effectiveness by univariate analysis n (%)

	Effective (n = 49)	Ineffective (n = 29)	P value
Age (yr), mean ± SD	74.0 ± 11.6	76.0 ± 7.5	0.39
Gender, male/female	32/17	21/8	0.78
Etiology, cholangiocarcinoma	32 (65.3)	18 (62.1)	0.81
Bismuth type IV	17 (34.6)	19 (65.5)	0.02
Total bilirubin (mg/dL), mean ± SD	9.9 ± 6.3	10.0 ± 4.7	0.93
Cholangitis	8 (16.3)	5 (17.2)	0.91
Impaired liver function	5 (10.2)	9 (31.0)	0.03
Drainage method, endoscopic drainage	43 (87.8)	27 (93.1)	0.71
Type of stent, metal stent	7 (14.3)	4 (13.8)	1.00
Drainage areas
Unilateral/bilateral	43/6	29/0	0.16
Drained liver volume (%), mean ± SD	51.1 ± 18.6	33.5 ± 12.5	< 0.01