Patient demographics and histopathological data on nonsmall cell lung cancer patients diagnosed from symptoms or diagnosed incidentally by chest radiography or computed tomography (CT)
| CT | Chest radiography | Symptoms | p-value | |
| Patients n | 41 | 130 | 334 | |
| Age years | 68±11 | 68±9 | 65±10 | 0.04 |
| Age >75 years | 14 (34) | 32 (25) | 61 (18) | 0.03 |
| Male | 22 (54) | 60 (46) | 171 (51) | 0.67 |
| History of smoking | ||||
| Ever | 36 (88) | 124 (95) | 324 (97) | 0.013 |
| Current | 22 (54) | 81 (62) | 230 (69) | 0.07 |
| Pack-years | 38±24 | 43±19 | 41±20 | 0.30 |
| COPD | 10 (24) | 29 (22) | 96 (29) | 0.37 |
| Coronary disease | 12 (29) | 46 (35) | 81 (24) | 0.05 |
| FEV1 <80% predicted | 9 (22) | 37 (28) | 126 (38) | 0.04 |
| Operation type | ||||
| Lobectomy | 33 (80) | 110 (85) | 235 (70) | 0.007 |
| Pneumonecomy | 2 (5) | 3 (2) | 64 (19) | <0.001 |
| Wedge resection | 6 (15) | 17 (13) | 35 (11) | 0.60 |
| Histology | ||||
| Adenocarcinoma | 32 (78) | 88 (70) | 172 (52) | <0.001 |
| Squamous cell | 6 (15) | 34 (27) | 119 (36) | <0.001 |
| Large cell | 3 (7) | 3 (2) | 25 (8) | 0.08 |
| Adenosquamous | 0 | 2 (2) | 13 (4) | 0.68 |
| Tumour size cm | 2.6±1.3 | 3.1±1.4 | 4.3±2.6 | <0.001 |
| Tumour stage | ||||
| IA | 21 (51) | 45 (35) | 63 (19) | <0.001 |
| IB | 8 (20) | 35 (27) | 69 (21) | 0.35 |
| IIA | 2 (5) | 24 (19) | 64 (19) | 0.08 |
| IIB | 6 (15) | 9 (7) | 53 (16) | 0.04 |
| IIIA | 4 (10) | 14 (11) | 65 (20) | 0.04 |
| IIIB | 0 | 1 (1) | 3 (1) | 1 |
| IV | 0 | 2 (2) | 17 (5) | 0.12 |
| Tumour grade | ||||
| Well differentiated | 11 (28) | 22 (18) | 37 (12) | 0.01 |
| Moderate | 11 (28) | 53 (43) | 132 (41) | 0.25 |
| Poor | 16 (40) | 46 (37) | 133 (41) | 0.68 |
| Undifferentiated | 2 (5) | 2 (2) | 21 (7) | 0.08 |
Data are presented as mean±sd or n (%), unless otherwise stated. COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in 1 s.