Table 2. Baseline characteristics of all TC patients.

Characteristic	No surgery	Wedge	Segmental	Lobectomy	Total
	(n = 235)	(n = 465)	(n = 113)	(n = 1074)	(n = 1887)
Age
<70y	98 (41.7%)	339 (72.9%)	95 (84.1%)	880 (81.9%)	1412 (74.8%)
≥70y	137 (58.3%)	126 (27.1%)	18 (15.9%)	194 (18.1%)	475 (25.2%)
Gender
Female	172 (73.2%)	355 (76.3%)	80 (70.8%)	738 (68.7%)	1345 (71.3%)
Male	63 (26.8%)	110 (23.7%)	33 (29.2%)	336 (31.3%)	542 (28.7%)
Race
White	201 (85.5%)	419 (90.1%)	102 (90.3%)	979 (91.2%)	1701 (90.1%)
Black	25 (10.6%)	27 (5.8%)	8 (7.1%)	54 (5.0%)	114 (6.0%)
Others	9 (3.9%)	19 (4.1%)	3 (2.6%)	41 (3.8%)	72 (3.9%)
Grade
Well/Moderate	76 (32.3%)	194 (41.7%)	52 (46.0%)	571 (53.2%)	893 (47.3%)
Poor/Undifferentiated	1 (0.4%)	3 (0.6%)	1 (0.9%)	3 (0.3%)	8 (0.4%)
Unknown	158 (67.3%)	268 (57.7%)	60 (53.1%)	500 (46.5%)	986 (52.3%)
Laterality
Right	146 (62.1%)	261 (56.1%)	43 (38.1%)	648 (60.3%)	1098 (58.2%)
Left	89 (37.9%)	204 (43.9%)	70 (61.9%)	426 (39.7%)	789 (41.8%)
Tumor size
T1 (≤3 cm)	184 (78.3%)	453 (97.4%)	105 (92.9%)	904 (84.2%)	1646 (87.2%)
T2 (≤5 cm, <3 cm)	38 (16.2%)	11 (2.4%)	7 (6.2%)	138 (12.8%)	194 (10.3%)
T3 (≤7 cm, >5 cm)	6 (2.5%)	– –	1 (0.9%)	20 (1.9%)	27 (1.4%)
T4 (>7 cm)	7 (3.0%)	1 (0.2%)	– –	12 (1.1%)	20 (1.1%)
Scope of regional lymph node
0	235 (100%)	319 (68.6%)	44 (38.9%)	4 (0.4%)	602 (31.9%)
1–3	– –	88 (18.9%)	29 (25.7%)	166 (15.5%)	283 (15.0%)
>3	– –	58 (12.5%)	40 (35.4%)	904 (84.1%)	1002 (53.1%)
Radiation
No	209 (89.9%)	462 (99.4%)	112 (99.1%)	1068 (99.4%)	1851 (98.1%)
Yes	26 (11.1%)	3 (0.6%)	1 (0.9%)	6 (0.6%)	36 (1.9%)
Chemotherapy
No	232 (98.7%)	464 (99.8%)	112 (99.1%)	1068 (99.4%)	1876 (99.4%)
Yes	3 (1.3%)	1 (0.2%)	1 (0.9%)	6 (0.6%)	11 (0.6%)