Table 3.

Characteristics of patients.

Characteristic		All patients (n = 83)
Age, median (years)		74.0 (45–85)
Sex	Female	13 (15.7%)
	Male	70 (84.3%)
Smoking status	Never	1 (1.2%)
	Former	39 (47.0%)
	Current	43 (51.8%)
Brinkman index, median (pack-year)		56.0 (0–162)
Cell differentiation	Well/Moderately/Poorly	18 (21.7%)
	Moderately	54 (65.1%)
	Poorly	11 (13.3%)
Pathologic stage	IA	41 (49.4%)
	(IA1/IA2/IA3)	(1/15/25)
	IB	42 (50.6%)
Mode of lung resection	Sub-lobar resection	18 (21.7%)
	Lobectomy	65 (78.3%)
Adjuvant chemotherapy	Performed	11(13.3%)
	(UFT/Platimun-based)	(4/7)
NLR, median (range)		2.2 (0.9–7.5)
PD-L1 expression (TPS)	0	40 (48.2%)
	≥1%	43 (51.8%)
	≥5%	31 (37.3%)
	≥10%	25 (30.1%)
	≥50%	14 (16.9%)

Data represented as absolute counts (%) or median (range).

NLR, neutrophil-to-lymphocyte ratio.

TPS, tumor proportion score.

UFT, tegafur and uracil.