Table 2 Imaging features of risk groups
| Â | High risk (509) | Non-high risk (1291) | P value |
|---|---|---|---|
Density | Â | Â | 0.676 |
 pGGN | 115 (22.59) | 280 (21.69) |  |
 mGGN | 394 (77.41) | 1011 (78.31) |  |
Size (mm) | Â | Â | Â |
 Average | 15.1 | 13.6 |  < 0.001* |
 Grouping by size |  |  |  < 0.001* |
  ≤ 10 | 158 (31.04) | 521 (40.36) |  |
 10–20 | 243 (47.74) | 577 (44.69) |  |
 20–30 | 108 (21.22) | 193 (14.95) |  |
Location | Â | Â | 0.040* |
 Right superior lobe | 208 (40.86) | 501 (38.81) |  |
 Right middle lobe | 31 (6.09) | 81 (6.27) |  |
 Right inferior lobe | 65 (12.77) | 209 (16.19) |  |
 Left superior lobe | 155 (30.45) | 329 (25.48) |  |
 Left inferior lobe | 50 (9.82) | 171 (13.25) |  |
Imaging sign | |||
 Lobulation | 105 (20.63) | 254 (19.67) | 0.648 |
 Vacuole | 89 (17.49) | 185 (14.33) | 0.093 |
 Spiculation | 108 (21.22) | 225 (17.43) | 0.062 |
 Calcification | 3 (0.59) | 6 (0.46) | 0.718 |
 Air bronchogram | 17 (3.34) | 43 (3.33) | 0.992 |
 Pleural indentation | 88 (17.29) | 212 (16.42) | 0.657 |
 Vessel convergence | 17 (3.34) | 35 (2.71) | 0.473 |