Table 2.

Patient Characteristics

Variable	N	%
Age (y)
≥70	322	18.3
<70	1441	81.7
Gender
Male	1007	57.1
Female	756	42.9
Pack year of Smoking
≥20	507	28.8
<20	1256	71.2
BMI (kg/m2)
>28	129	7.3
18-28	1587	90.0
<18	47	2.7
Location of tumor
Left Upper Lobe	427	24.2
Left Lower Lobe	306	17.4
Right Upper Lobe	520	29.5
Right Middle Lobe	154	8.7
Right Lower Lobe	356	20.2
Comorbidities
Yes	393	22.3
No	1370	77.7
FEV1%
≥50	1716	97.3
<50	47	2.7
TNM staging
IA	611	34.7
IB	752	42.7
IIA	118	6.7
IIB	28	1.6
IIIA	254	14.4
Tumor size (cm)
≥3	1062	60.2
<3	701	39.8
N status
N0	1395	79.1
N1	134	7.6
N2	234	13.3
Histology
Adenocarcinoma	857	48.6
Squamous carcinoma	170	9.6
Others	420	23.8
Type of VATS
Complete	1710	97.0
Hybrid	53	3.0
Number of ports
3	1423	80.7
4	340	19.3
Operative time (min)
≥240	189	10.7
<240	1574	89.3
Blood loss (ml)
≥600	225	12.8
<600	1538	87.2