Table 1. Patient characteristics.
| Variable | T1a (n=82) | T1b (n=234) | T1c (n=117) | P |
|---|---|---|---|---|
| Sex | ||||
| Male | 21 | 93 | 42 | 0.072 |
| Female | 67 | 141 | 75 | |
| Age, y | 54.35±10.10 | 59.16±9.58 | 58.59±7.87 | <0.001 |
| History of malignancy | ||||
| No | 79 | 221 | 116 | 0.057 |
| Yes | 3 | 13 | 1 | |
| Smoking index | ||||
| 0 | 77 | 186 | 90 | 0.011 |
| 0–400 | 2 | 15 | 13 | |
| ≥400 | 3 | 33 | 14 | |
| Surgery | ||||
| Lobectomy | 67 | 216 | 113 | 0.001 |
| Sublobectomy | 15 | 18 | 4 | |
| Location | ||||
| Left | 39 | 113 | 59 | 0.906 |
| Right | 43 | 121 | 58 | |
| Segments | ||||
| Upper | 61 | 152 | 82 | 0.578 |
| Middle | 3 | 11 | 4 | |
| Lower | 18 | 71 | 120 | |
| VPI | ||||
| No | 80 | 188 | 66 | <0.001 |
| Yes | 2 | 46 | 51 | |
| pN | ||||
| N0 | 82 | 209 | 82 | <0.001 |
| N1 | 0 | 11 | 14 | |
| N2 | 0 | 14 | 21 | |
| Total dissected LNs number | 11.45±5.47 | 13.49±6.90 | 15.26±5.90 | <0.001 |
| N1 group | 5.74±3.79 | 6.35±3.56 | 7.12±3.45 | 0.024 |
| N1 group lns metastasis | ||||
| Yes | 0 | 19 | 28 | <0.001 |
| No | 82 | 215 | 89 | |
| T, mm | 8.19±1.51 | 15.16±2.87 | 24.19±2.58 | <0.001 |
| C, mm | 2.05±2.84 | 7.44±6.73 | 16.43±9.29 | <0.001 |
| DM, mm | 1.03±2.28 | 5.51±6.05 | 14.17±9.10 | <0.001 |
| DP, mm | 8.15±2.78 | 14.54±4.98 | 21.40±5.91 | <0.001 |
| CTR | 0.25±0.34 | 0.47±0.41 | 0.68±0.38 | <0.001 |
VPI, visceral pleural invasion; pN, conventional pathologically lymph nodes; LN, lymph nodes; T, the largest axial diameter of the lesion on the lung window setting; C, the diameter of consolidation on the axial image on the lung window setting; DM, the largest axial diameter of the lesion on the mediastinal window setting; DP, diameter of nodule measured by postoperative pathology; CTR, the ratio of the maximum diameter of consolidation relative to the maximum tumor diameter from the lung window.