Table 3.

Analysis of preoperative biliary drainage-related factors n (%)

Factors	Total	Uncomplicated	Complicated	P
	(n = 40)	(n = 20)	(n = 20)
Drainage methods				0.723
ENBD	29 (72.5)	15 (75.0)	14 (70.0)
PTBD	11 (27.5)	5 (25.0)	6 (30.0)
Initial bilirubin (Bi)	229.1 ± 135.1	210.3 ± 157.3	246.2 ± 111.2	0.223
(μmol/L)
Preop. bilirubin (Bo)	131.7 ± 92.3	123.1 ± 94.1	140.2 ± 94.1	0.552
(μmol/L)
Duration of	10 ± 9	8 ± 5	12 ± 12	0.392
drainage (d)
Decrease in bilirubin	95.8 ± 104.3	87.2 ± 94.1	104.3 ± 114.6	0.715
(Bi–Bo, dB, μmol/L)
Ratio of decrease	0.37 ± 0.35	0.37 ± 0.31	0.38 ± 0.40	0.892
in bilirubin (dB/Bi)
Rate of decrease	10.1 ± 16.6	13.2 ± 14.5	7.0 ± 18.1	0.425
in bilirubin
(dB/d, μmol/L)
Bpod1 (μmol/L)	1.9 ± 8.6	4.4 ± 5.4	-0.6 ± 10.3	0.180
Bpod2 (μmol/L)	2.2 ± 9.1	4.4 ± 5.8	-0.1 ± 11.2	0.228

Variables are presented as mean ± SD, unless specified otherwise. ENBD: Endoscopic nasobiliary drainage; PTBD: Percutaneous transhepatic biliary drainage; Bpod1: Decrease in serum bilirubin during the first postoperative week; Bpod2: Decrease in serum bilirubin during the second postoperative week.