. Author manuscript; available in PMC: 2015 Dec 1.

Published in final edited form as: Cancer Prev Res (Phila). 2014 Apr 22;7(12):1179–1185. doi: 10.1158/1940-6207.CAPR-13-0438

Table 1.

Characteristics of NCNs reported on the baseline CT screen

All Nodules		N=11,779
		% of NCNs
Nodule Attenuation	Soft Tissue	74.8
	Ground Glass	15.3
	Mixed	4.3
	Other/Unknown	5.6
Nodule Margins	Smooth	65.9
	Spiculated	10.0
	Poorly Defined	19.9
	Unable to Determine	4.3
Nodule Size (largest diameter)	4–9 mm	83.9
	10+ mm	16.1
Nodule Location	Right Upper Lobe	23.6
	Right Middle Lobe	13.7
	Right Lower Lobe	23.7
	Left Upper Lobe	14.4
	Lingula	4.3
	Left Lower Lobe	19.7
	Other	0.6

Note: All NCNs are 4+mm.