Table IV. Characteristics of the samples used in validation.

Variable	Early LC (n = 88)			Healthy (n = 36)			LBL (n = 18)			P
	No.	Mean	%	No.	Mean	%	No.	Mean	%
Age (years)										0.051
Mean		59.6			54.8			58.6
Standard deviation		10			10.6			9.95
Sex										0.543
Male	55		64.7	22		61.1	12		66.7
Female	30		35.3	14		38.9	6		33.3
Smoking history (pack-years)										0.110
0	26		29.5	13		36.1	6		33.3
<20	12		13.6	5		13.9	3		16.7
≥20	50		56.8	18		50.0	9		50
Type
Small Cell Lung Cancer	16		18.2
Adenocarcinoma	48		54.5
Squamous Cell Carcinoma	24		27.3