Characteristic | Total (n=294) | CT-suspect group (n=84) | CT-negative group (n=210) | χ2 | P value |
---|---|---|---|---|---|
Sex | Â | Â | Â | 3.284 | 0.070 |
 Male | 228 (77.6%) | 71 (84.5%) | 157 (74.8%) |  |  |
 Female | 66 (22.4%) | 13 (15.5%) | 53 (25.2%) |  |  |
Age (years) | Â | Â | Â | 0.721 | 0.396 |
 <60 | 141 (48.0%) | 37 (44.0%) | 104 (49.5%) |  |  |
 ≥60 | 153 (52.0%) | 47 (56.0%) | 106 (50.5%) |  |  |
Tumor location | Â | Â | Â | 0.411 | 0.814 |
 Upper thoracic | 70 (23.8%) | 19 (22.6%) | 51 (24.3%) |  |  |
 Middle thoracic | 163 (55.4%) | 49 (58.3%) | 114 (54.3%) |  |  |
 Lower thoracic | 61 (20.8%) | 16 (19.0%) | 45 (21.4%) |  |  |
Surgical approach | Â | Â | Â | 1.723 | 0.189 |
 Ivor–Lewis | 92 (31.3%) | 31 (36.9%) | 61 (29.0%) |  |  |
 McKeown | 202 (68.7%) | 53 (63.1%) | 149 (71.0%) |  |  |
Length of lesion | Â | Â | Â | 0.311 | 0.577 |
 <4 cm | 171 (58.2%) | 39 (46.4%) | 90 (42.9%) |  |  |
 ≥4 cm | 123 (41.8%) | 45 (53.6%) | 120 (57.1%) |  |  |
Angioinvasion | Â | Â | Â | 0.707 | 0.400 |
 No | 272 (92.5%) | 76 (90.5%) | 196 (93.3%) |  |  |
 Yes | 22 (7.5%) | 8 (9.5%) | 14 (6.7%) |  |  |
Perineural invasion | Â | Â | Â | 0.973 | 0.324 |
 No | 56 (19.0%) | 65 (77.4%) | 173 (82.4%) |  |  |
 Yes | 238 (81.0%) | 19 (22.6%) | 37 (77.4%) |  |  |
No. of removed LNs | Â | Â | Â | 1.875 | 0.171 |
 <15 | 88 (29.9%) | 30 (35.7%) | 58 (27.6%) |  |  |
 ≥15 | 206 (70.1%) | 54 (64.3%) | 152 (72.4%) |  |  |
No. of dissected LN stations | Â | Â | Â | 0.702 | 0.402 |
 <6 | 91 (31.0%) | 29 (34.5%) | 62 (29.5%) |  |  |
 ≥6 | 203 (69.0%) | 55 (65.5%) | 148 (70.5%) |  |  |
Tumor grade | Â | Â | Â | 0.002 | 0.999 |
 Well-differentiated | 63 (21.4%) | 18 (21.4%) | 45 (21.4%) |  |  |
 Moderately differentiated | 136 (46.3%) | 39 (46.4%) | 97 (46.2%) |  |  |
 Poorly differentiated | 95 (32.3%) | 27 (32.1%) | 68 (32.4%) |  |  |
Adjuvant therapy | Â | Â | Â | 1.827 | 0.401 |
 No | 139 (47.3%) | 41 (48.8%) | 98 (46.7%) |  |  |
 Chemotherapy | 132 (44.9%) | 34 (40.5%) | 98 (46.7%) |  |  |
 Radiotherapy/Chemoradiotherapy | 23 (7.8%) | 9 (10.7%) | 14 (6.7%) |  |  |