Table 3. Univariate analysis of positive N2 nodes.
| Variables | Negative N2 node (%) | Positive N2 node (%) | P value |
|---|---|---|---|
| Sex | |||
| Male | 127 (85.8) | 21 (14.2) | |
| Female | 147 (88.0) | 20 (12.0) | 0.561 |
| Age | |||
| <59 | 128 (83.7) | 25 (16.3) | |
| ≥59 | 146 (91.0) | 16 (9.0) | 0.088 |
| Smoking status | |||
| Never | 193 (88.5) | 25 (11.5) | |
| Current or former | 81 (83.5) | 16 (16.5) | 0.221 |
| Symptom | |||
| Absent | 206 (77.7) | 29 (12.3) | |
| Present | 68 (85.0) | 12 (15.0) | 0.541 |
| Tumor size | |||
| ≤1 cm | 58 (96.7) | 2 (3.3) | |
| 1-2 cm | 216 (84.7) | 39 (15.3) | 0.01 |
| Tumor location | |||
| Central | 26 (81.2) | 6 (18.8) | |
| Peripheral | 248 (87.6) | 35 (12.4) | 0.459 |
| Lobe distribution | |||
| UL | 181 (91.0) | 18 (9.0) | |
| Non-UL | 92 (80.0) | 23 (20.0) | 0.006 |
| Histology | |||
| AC | 244 (86.8) | 37 (13.2) | |
| Non-AC | 30 (88.2) | 4 (11.8) | 0.818 |
| MPA | 14 (58.3) | 10 (41.7) | <0.001 |
| CEA | |||
| <5 | 230 (80.9) | 23 (9.1) | |
| ≥5 | 44 (71.0) | 18 (29.0) | <0.001 |
UL, upper lobes; AC, adenocarcinoma; MPA, micropapillary adenocarcinoma; CEA, carcinoembryonic antigen.