TABLE 1.

The characteristics of the study subjects.

Variables	Total	Type B2	Type B2 + B3	Type B3
Gender
Male	137 (58.1%)	77 (57.9%)	23 (59.0%)	37 (57.8%)
Female	99 (41.9%)	56 (42.1%)	16 (41.0%)	27 (42.2%)
Age (years)
Average	48.7 (±12.8)	47.1 (±12.8)	49.7 (±11.8)	51.3 (±12.9)
Myasthenia gravis	99 (41.9%)	60 (45.1%)	20 (51.2%)	19 (29.6%)
TNM stage
I + II	177 (75.0%)	107 (80.5%)	29 (74.4%)	41 (64.1%)
III + IV	59 (25.0%)	26 (19.5%)	10 (25.6%)	23 (35.9%)
Masaoka–Koga stage
I + II	150 (63.6%)	92 (69.2%)	22 (56.4%)	36 (56.3%)
III + IV	86 (36.4%)	41 (30.8%)	17 (43.6%)	28 (43.7%)
Tumor size
<6 cm	152 (64.4%)	85 (63.9%)	23 (59.0%)	44 (68.8%)
≥6 cm	84 (35.6%)	48 (36.1%)	16 (41.0%)	20 (31.2%)
Smoking	131.6 (±305.9)	131.9 (±311.1)	117.9 (±271.6)	139.4 (±318.8)
Tumor invasion
Yes	89 (37.7%)	45 (33.8%)	17 (43.6%)	27 (42.2%)
No	147 (62.3%)	88 (66.2%)	22 (56.4%)	37 (57.8%)