Table 1 Basic characteristics of the patients

Sex

 Male

15

15

1.0

 Female

5

5

Age, mean ± SD [years]

63.2 ± 6.7 (48–75)

61.0 ± 10.9 (32–72)

0.447

BMI, mean ± SD [kg/m²]

24.3 ± 1.8

23.8 ± 1.6

0.357

ASA score

 0

12

10

0.748

 1

7

8

 2 or more

1

2

UICC stage

 ≤ II A

10 (IA = 2, IB = 3, IIA = 5)

6 (IA = 0, IB = 0, IIA = 6)

0.356

 II B

7

8

 III A

3

6

Pathological type

 Differentiated

5

7

0.630

 Undifferentiated

13

10

 Others

2

3

Tumor size (cm)

3.3 ± 1.2

4.8 ± 1.4

0.016

Siewert type

 II

9

4

0.091

 III

11

16