Table 1 Patient demographics and clinicopathological characteristics

Number of cases, n

205

407

Gender

χ² = 0.004

0.947

 Male, n(%)

128(62.4%)

253(62.2%)

 Female, n(%)

77(37.6%)

154(37.8%)

Age, years

67.90 ± 10.2

69.22 ± 9.268

t = -1.615

0.107

BMI, kg/m2, median (range)

24.4(22.4 ~ 26.1)

24.4(22.7 ~ 26.6)

z = -0.946

0.344

Hb, g/L, median (range)

124.1(117.4 ~ 131.7)

124.2(116.2 ~ 131.7)

z = -0.782

0.434

Alb, g/L, median (range)

38.8(36.6 ~ 41.4)

38.6(36.3 ~ 41.3)

z = -1.591

0.112

chronic disease

 Diabetes, n(%)

28(13.7%)

51(12.5%)

χ² = 0.154

0.695

 Hypertension, n(%)

46(22.4%)

85(20.9%)

χ² = 0.196

0.658

 pulmonary disease, n(%)

12(5.9%)

22(5.4%)

χ² = 0.052

0.819

History of abdominal surgery, n(%)

24(11.7%)

61(15.0%)

χ² = 1.227

0.268

Tumor diameter, cm, median (range)

2.8(1.6 ~ 4.2)

2.8(1.5 ~ 4.3)

z = -0.665

0.506

Tumor Location, n

χ² = 3.341

0.188

 Upper

89(43.4%)

206(50.6%)

 Middle

41(20.0%)

79(19.4%)

 Distal

75(36.6%)

122(30.0%)

Extent of resection

χ² = 2.729

0.099

 Total gastrectomy

130(63.4%)

285(70.0%)

 Distal gastrectomy

75(36.6%)

122(30.0%)

Types of reconstruction

χ² = 2.729

0.099

 Roux-en-Y

130(63.4%)

285(70.0%)

 Billroth-II

75(36.6%)

122(30.0%)

ASA risk score, n(%)

χ² = 3.615

0.164

 I

63(30.7%)

105(25.8%)

 II

111(54.1%)

217(53.3%)

 III

31()15.1%

85(20.9%)

Tumor stage, n(%)

χ² = 3.876

0.275

 I

18(8.8%)

45(11.1%)

 II

55(26.8%)

91(22.4%)

 III

108(52.7%)

236(58.0%)

 IV

24(11.7%)

35(8.6%)