Table 1 Baseline characteristics before and after propensity score matching

Sex, No.(%)

1.000

 < 0.01

 Male

129(50.39)

232(59.64)

0.021

86(60.99)

86(60.99)

 Female

127(49.61)

157(40.36)

55(39.01)

55(39.01)

 Age (yrs), mean(SD)

62.83(9.70)

62.10(9.17)

0.333

62.55(9.15)

63.09(9.03)

0.624

0.06

 BMI (Kg/cm²), mean(SD)

23.12(3.09)

22.75(2.80)

0.112

22.92(3.09)

22.66(2.81)

0.459

0.09

 ASA score, No. (%)

0.872

0.471

0.05

 I

57(22.27)

82(21.08)

39(27.66)

34(24.11)

 II

156(60.94)

245(62.98)

77(54.61)

87(61.70)

 III

43(16.80)

62(15.94)

25(17.73)

20(14.18)

 CA199 (U/mL), median(IQR)

204.40(69.50 ~ 814.70)

256.00(98.50 ~ 455.00)

0.791

202.30(100.10 ~ 545.80)

187.60(72.70 ~ 369.80)

0.843

0.02

 Tbil (μmol/L), median(IQR)

47.85(44.10 ~ 53.65)

131.00(73.10 ~ 230.30)

 < 0.001

49.70(44.70 ~ 57.30)

60.50(28.90 ~ 108.80)

0.798

0.03

 ALP (μmol/L), median(IQR)

362.65(216.40 ~ 451.15)

327.00(225.00 ~ 462.00)

0.168

345.00(210.00 ~ 440.00)

269.00(189.30 ~ 424.80)

0.856

0.02

 AST (μmol/L), median(IQR)

43.00(33.20 ~ 87.60)

89.00(54.00 ~ 156.30)

 < 0.001

60.60(35.50 ~ 132.00)

74.00(46.00 ~ 119.30)

0.909

0.01

 ALT (μmol/L), median(IQR)

59.10(30.90 ~ 133.65)

115.30(60.00 ~ 183.90)

 < 0.001

78.50(36.60 ~ 154.60)

92.90(56.70 ~ 143.40)

0.874

0.02

 Albumin (μmol/L), median(IQR)

35.60(33.35 ~ 38.45)

35.90(33.40 ~ 39.20)

0.639

35.60(33.00 ~ 38.20)

35.60(32.50 ~ 39.60)

0.928

0.01

 Number of lymphnodes, median(IQR)

12.00(8.00 ~ 16.00)

14.00(5.00 ~ 21.00)

0.760

12.00(6.00 ~ 18.00)

13.00(7.00 ~ 17.00)

0.701

0.05

 Maximun Tumor Size(mm), mean(SD)

3.03(1.35)

2.89(1.26)

0.167

2.73(1.18)

2.83(1.29)

0.492

0.08

 Preoperative biliary drainage, No. (%)

193(75.39)

268(69.25)

0.091

105(74.47)

90(64.29)

0.064

0.19

 Bismuth-Corlett Type, No. (%)

0.895

0.95

0.01

 I

72(28.13)

108(27.76)

44(31.21)

39(27.66)

 II

63(24.61)

85(21.85)

24(17.02)

23(16.31)

 IIIa

24(9.38)

35(9.00)

9(6.38)

10(7.09)

 IIIb

33(12.89)

52(13.37)

23(16.31)

27(19.15)

IV

64(25.00)

109(28.02)

41(29.08)

42(29.79)

 TNM stage, No. (%)

 < 0.001

0.725

0.11

 Miss

8(3.13)

9(2.31)

4(2.84)

7(4.96)

 I(T1N0M0)

25(9.77)

66(16.97)

22(15.60)

23(16.31)

 II(T2a/2bN0M0)

108(42.19)

148(38.05)

60(42.55)

56(39.72)

 IIIA(T3N0M0)

38(14.84)

31(7.97)

8(5.67)

12(8.51)

 IIIB(T4N0M0)

30(11.72)

25(6.43)

7(4.96)

11(7.80)

 IVA(T, N2M0)

34(13.28)

80(20.57)

30(21.28)

23(16.31)

 IVB(T,N,M1)

13(5.08)

30(7.71)

10(7.09)

9(6.38)