Table 1. Baseline data of 163 patients with thoracic ESCC.

Factor	Case	Percentage (%)
Sex
Male	113	69.3
Female	50	30.7
Age
≤60 y	47	28.8
>60 y	116	71.2
Location
Upper	62	38.0
Middle	80	49.1
Lower	21	12.9
TNM stage
I	37	22.7
II	41	25.2
III	43	26.4
IV	42	25.7

ESCC, esophageal squamous cancer.