Table 1. Demographic Characteristics of the Study Cases.

Baseline characteristics	Values
No. of patients	108
Age (yr) (range)	69.0 (61.0–6.0)
Men (n, %)	68 (63.0)
Serum CEA level (ng/mL) (range)	3.5 (1.9–10.6)
No. of LNs	138
Location of LNs (n, %)
Paratracheal LN	52 (37.7)
Subcarinal LN	54 (39.1)
Hilar, interlobar LN	32 (23.2)
Core pathology (n, %)
No evidence of cancer	64 (46.4)
Adenocarcinoma	53 (38.4)
Squamous cell carcinoma	19 (13.8)
Poorly differentiated carcinoma	2 (1.4)

CEA, carcinoembryonic antigen; LN, lymph node.

Values are presented as median (range) or n (%) unless otherwise indicated.