Table 1 Clinical characteristics of the two groups of patients before and after Propensity score matching

Gender [n(%)]

4.296

0.038

0.09

0.765

 Male

54(57.4)

82(44.3)

53(58.2)

51(56.0)

 Female

40(42.6)

103(55.7)

38(41.8)

40(44.0)

Age [M(P25,P75)]

64(54,72)

56(50.5,68)

-2.725

0.006

64(54,72)

65(53,73)

-0.415

0.678

Preoperative Tbil [umol/L,M(P25,P75)]

41.4(35.2,51.9)

43.7(32.9,54.8)

-0.963

0.335

42.1(35.2,51.9)

43.1(31.6,53.9)

-0.31

0.757

Preoperative hospital stay [d,M(P25,P75)]

5(3,7)

5(3,8)

-0.168

0.867

5(3,7)

4(2,7)

-1.578

0.115

BMI[M(P25,P75)]

26.8(22.5,30.8)

27.9(22.6,31.5)

-0.879

0.379

27(22.5,30.8)

27.8(22.4,31.2)

-0.256

0.798

ALB [g/L,M(P25,P75)]

34.2(31.0,36.1)

33.9(31.3,35.5)

-0.533

0.594

34.2(31.1,36.1)

32.7(30.6,35.0)

-1.053

0.292

Common bile duct diameter [mm,M(P25,P75)]

15.0(11.8,18.0)

14.5(12.2,17.4)

-0.664

0.507

15(11.8,18.0)

14.5(12.4,17.5)

-0.391

0.696

Hypertension [n(%)]

1.085

0.298

0.034

0.854

 Positive

20(21.3)

30(16.2)

19(20.9)

18(19.8)

 Negative

74(78.7)

155(83.8)

72(79.1)

73(80.2)

Coronary heart disease [n(%)]

1.071

0.301

1.72

0.189

 Positive

10(10.6)

28(15.1)

9(9.9)

15(16.5)

 Negative

84(89.4)

157(84.9)

82(90.1)

76(83.5)

Type 2 diabetes [n(%)]

0.393

0.531

0.054

0.817

 Positive

12(12.8)

19(10.3)

11(12.1)

10(11.0)

 Negative

82(87.2)

166(89.7)

80(87.9)

81(89.0)

Cerebral infarction [n(%)]

0.179

0.672

0.028

0.867

 Positive

24(25.5)

43(23.2)

24(26.4)

25(27.5)

 Negative

70(74.5)

142(76.8)

67(73.6)

66(72.5)

COPD [n(%)]

2.737

0.098

0.871

0.351

 Positive

8(8.5)

7(3.8)

7(7.7)

4(4.4)

 Negative

86(91.5)

178(96.2)

84(92.3)

87(95.6)

History of upper abdominal surgery [n(%)]

0.777

0.378

2.643

0.104

 Positive

17(18.1)

26(14.1)

15(16.5)

24(26.4)

 Negative

77(81.9)

159(85.9)

76(83.5)

67(73.6)