Table 1. Patient demographics.

Variables	n (%)
Gender
Male	201 (80.7)
Female	48 (19.3)
Age (y)	63.4±7.3
BMI (kg/m2)	23.1±2.9
ASA
I	7 (2.8)
II	222 (89.2)
III	20 (8.0)
Tumor location
Upper	33 (13.3)
Middle	156 (62.7)
Lower	60 (24.0)
Clinical stage
I	72 (28.9)
II	112 (45.0)
III	43 (17.3)
IV	22 (8.8)
Neoadjuvant therapy
Yes	20 (8.0)
No	229 (92.0)

BMI, body mass index; ASA, American Society of Anesthesiologists.