Table 1.

Patient characteristics of central and peripheral squamous cell carcinomas (n = 50).

	Central (n = 15)	Peripheral (n = 35)	P value
Age
Median	72	75
Range	58–88	62–86	0.21
Sex
Male	14	34
Female	1	1	0.53
Smoking
BI index median	960	1000
BI index range	400–1880	0–2000	0.66
Stage I	7	20	0.37
Stage II	5	10	0.83
Stage III	3	3	0.29
Stage IV	0	0
Severe emphysema (HRCT)	2	17	0.02
Interstitial pneumonia (HRCT)	5	21	0.08