Table 2 NLST test set nodule characteristics
From: High precision localization of pulmonary nodules on chest CT utilizing axial slice number labels
Nodule variable | Missed/incorrect/unintended nodule predictions n (%) | Correct nodule predictions n (%) | p | Totals n (%) |
|---|---|---|---|---|
N | 35 (100%) | 54 (100%) | – | 89 (100%) |
Location | Â | Â | 0.307 | Â |
 Left lower lobe | 7 (20%) | 10 (19%) |  | 17 (19%) |
 Left upper lobe | 6 (17%) | 7 (13%) |  | 13 (15%) |
 Lingula | 0 (0%) | 6 (11%) |  | 6 (7%) |
 Right lower lobe | 12 (34%) | 12 (22%) |  | 24 (27%) |
 Right middle lobe | 4 (11%) | 10 (19%) |  | 14 (16%) |
 Right upper lobe | 6 (17%) | 9 (17%) |  | 15 (17%) |
Central versus peripheral | Â | Â | 0.332 | Â |
 Central | 3 (9%) | 1 (2%) |  | 4 (4%) |
 Peripheral | 32 (91%) | 53 (98%) |  | 85 (96%) |
Subpleural versus parenchymal | Â | Â | 0.807 | Â |
 Subpleural | 19 (54%) | 32 (59%) |  | 38 (43%) |
 Parenchymal | 16 (46%) | 22 (41%) |  | 51 (57%) |
Margins | Â | Â | 0.254 | Â |
 Smooth | 27 (77%) | 46 (85%) |  | 73 (82%) |
 Poorly defined | 5 (14%) | 5 (9%) |  | 10 (11%) |
 Spiculated | 1 (3%) | 3 (6%) |  | 4 (4%) |
 Unable to determine | 2 (6%) | 0 (0%) |  | 3 (2%) |
Diameter (mm) | Â | Â | 0.752 | Â |
 (mean ± SD) | 4.77 ± 2.78 | 4.94 ± 1.75 |  | 4.88 ± 2.26 |
Attenuation | Â | Â | 0.028* | Â |
 Soft tissue | 27 (77%) | 51 (94%) |  | 78 (88%) |
 Ground glass | 3 (9%) | 1 (2%) |  | 4 (4%) |
 Mixed | 1 (3%) | 2 (4%) |  | 4 (4%) |
 Unable to determine | 4 (11%) | 0 (0%) |  | 3 (3%) |