Table 1.

Characteristics of patients

Characteristic	Value
Age	68.1 ± 9.1
Sex
Male	65
Female	33
Pathologic N stage
N0	49
N1	8
N2	31
N3	10
Histologic type of primary tumor
Adenocarcinoma	55
Squamous cell carcinoma	42
Adenosquamous carcinoma	1

The values are number of patients, except age in years, mean ± standard deviation