Table 1 Statistical characteristics and results of the comparison tests of preoperative data

General conditions

Age(years)

60.27 ± 9.78

59.88 ± 9.49

0.832^#

Sex (male/female)

78/49

61/51

0.277^*

BMI(kg/m²)

22.58 ± 2.91

24.28 ± 3.45

0.083^#

ASA(n,I/II/III/IV)

2/101/23/1

0/94/18/0

0.402^*

Initial symptoms [n (%)]

Jaundice

74(58.27%)

67(59.82%)

0.807^*

Abdominal pain

54(42.51%)

49(43.75%)

0.848^*

Fever

12(9.44%)

4(3.57%)

0.070^*

Comorbidities [n (%)]

CHD

7(5.51%)

10(8.92%)

0.305^*

HBP

39(30.70%)

40(35.71%)

0.412^*

DM

20(15.75%)

16(14.28%)

0.752^*

Pancreatitis history

4(3.15%)

7(6.25%)

0.254^*

Hepatitis

8(6.30%)

8(7.14%)

0.928^*

Opearation history

13(10.24%)

15(13.39%)

0.449^*

Blood tests

CA199(U/mL)^a

94.50

68.50

0.315⁺

CA125(U/mL)^a

12.90

14.70

0.323⁺

Direct bilirubin(mmol/L)^a

60.00

64.00

0.773⁺

Preoperative treatments [n (%)]

Preoperative PTCD

46(36.22%)

36(32.14%)

0.508^*

Preoperative ENBD

17(13.38%)

13(11.60%)

0.679^*