By Identified Smoking Status		By Gender			By Age
Level 1 Workup	IPN Population (% of Total)	Current/ Former Smoker	Not Identified as Smoker	Male	Female	18-34	35-44	45-54	55-64
CT of thorax, without contrast	4455 (29.6%)	1107 (33.9%)	3348 (28.4%)	1880 (27.9%)	2575 (30.9%)	152 (16.6%)	584 (24.7%)	1693 (29.0%)	2026 (34.1%)
PET	514 (3.4%)	166 (5.1%)	348 (3.0%)	224 (3.3%)	290 (3.5%)	17 (1.9%)	61 (2.6%)	176 (3.0%)	260 (4.4%)
Non-surgical biopsy	444 (2.9%)	149 (4.6%)	295 (2.5%)	191 (2.8%)	253 (3.0%)	28 (3.1%)	61 (2.6%)	171 (2.9%)	184 (3.1%)
Surgical resection	58 (0.4%)	20 (0.6%)	38 (0.3%)	25 (0.4%)	33 (0.4%)	3 (0.3%)	5 (0.2%)	21 (0.4%)	29 (0.5%)
No workup1	9593 (63.7%)	1826 (55.9%)	7767 (65.8%)	4408 (65.5%)	5185 (62.2%)	715 (78.1%)	1651 (69.9%)	3782 (64.7%)	3445 (58.0%)
Total	15 064 (100.0%)	3268 (100.0%)	11 796 (100.0%)	6728 (100.0%)	8336 (100.0%)	915 (100.0%)	2362 (100.0%)	5843 (100.0%)	5944 (100.0%)