Table 1. Demographic, clinical and pathological characteristics of patients.

Variable	Patients (n=40)
Age (years)	53.7±8.3
Sex ratio (male:female)	12:28
Comorbidity	21 (52.5%)
Previous lung operation	3 (7.5%)
No. of dissected mediastinal stations	5.5±1.6
Mortality	0
Tumor size (cm)	0.3–1.3
Pathological results	MIA
Pathological staging	pT1aN0M0 (Ia)

Data are expressed as mean ± SD or number (%). MIA, microinvasive adenocarcinoma.