Table 1. Clinicopathologic Characteristics of 620 Patients With 622 Nodules.

Characteristics	Patients or nodules, No. (%)
Sex
Female	442 (71.3)
Male	178 (28.7)
Age, mean (SD), y	53.5 (12.0)
Smoking history, ever	102 (16.5)
Operative procedure
Lobectomy	121 (19.5)
Segmentectomy	179 (28.8)
Wedge resection	322 (51.7)
Tumor location
LUL	158 (25.4)
LLL	96 (15.4)
RUL	216 (34.7)
RML	43 (7.0)
RLL	109 (17.5)
Radiologic parameters
Radiologic tumor size, mm
≤10	224 (36.0)
10 to ≤20	311 (50.0)
>20	87 (14.0)
Solid component size, median (range), mm	2.5 (0-26.0)
Shape
Round/oval	244 (39.2)
Polygonal/irregular	378 (60.8)
Margin
Smooth	244 (39.2)
Lobulated/spiculated	378 (60.8)
Tumor-lung interface
Clear	476 (76.5)
Unclear	146 (23.5)
Bubble lucency
Absent	267 (42.9)
Present	355 (57.1)
Air bronchogram
Absent	313 (50.3)
Present	309 (49.7)
Pleural indentation
Absent	409 (65.8)
Present	213 (34.2)
Pathologic characteristics
Pathological diagnosis
AIS	47 (7.6)
MIA	342 (55.0)
IAD	233 (37.4)
Histological predominant subtypes
LPA	48 (20.6)
APA	130 (55.8)
PPA	52 (22.3)
MPA	0 (0)
SPA	1 (0.4)
IMA	2 (0.9)
Pathologic tumor size, median (range), mm	10.0 (3.0-35.0)
Pathological stage
0	47 (7.5)
IA1	382 (61.4)
IA2	141 (22.7)
IA3	19 (3.1)
IB	33 (5.3)

Abbreviations: AIS, adenocarcinoma in situ; APA, acinar predominant adenocarcinoma; IAD, invasive adenocarcinoma; IMA, invasive mucinous adenocarcinoma; LLL, left lower lobe; LPA, lepidic predominant adenocarcinoma; LUL, left upper lobe; MIA, minimally invasive adenocarcinoma; MPA, micropapillary predominant adenocarcinoma; PPA, papillary predominant adenocarcinoma; RLL, right lower lobe; RML, right middle lobe; RUL, right upper lobe; SPA, solid predominant adenocarcinoma.