Characteristic | All patients | STAS (+) | STAS (-) | t/χ2 value | p-value |
---|---|---|---|---|---|
Tumor location | Â | Â | Â | 1.964a | 0.147 |
 Central | 9 | 7 | 2 |  |  |
 Peripheral | 99 | 53 | 46 |  |  |
Type of nodules |  |  |  | 16.233 |  < 0.001 |
 Solid | 58 | 42 | 16 |  |  |
 Part-solid | 39 | 16 | 23 |  |  |
 GGN | 11 | 2 | 9 |  |  |
Maximum tumor diameter, cm | 2.2 ± 0.9 | 2.4 ± 0.9 | 1.9 ± 0.7 | 3.400 | 0.001 |
Maximum solid component diameter, cm | 1.7 ± 1.1 | 2.2 ± 1.0 | 1.2 ± 1.0 | 4.990 |  < 0.001 |
CTR |  |  |  | 22.377 |  < 0.001 |
 CTR = 1 | 58 | 42 | 16 |  |  |
 0.5 ≤ CTR < 1.0 | 28 | 15 | 13 |  |  |
 0 ≤ CTR < 0.5 | 22 | 3 | 19 |  |  |
Shape | Â | Â | Â | 0.007 | 0.931 |
 Round to oval | 49 | 27 | 22 |  |  |
 Irregular | 59 | 33 | 26 |  |  |
Margin | Â | Â | Â | 0.347 | 0.556 |
 Smooth | 71 | 38 | 33 |  |  |
 Blurred | 37 | 22 | 15 |  |  |
Vascular convergence | Â | Â | Â | 2.779 | 0.095 |
 Present | 70 | 43 | 27 |  |  |
 Absent | 38 | 17 | 21 |  |  |
Air bronchogram | Â | Â | Â | 2.067 | 0.15 |
 Present | 12 | 9 | 3 |  |  |
 Absent | 96 | 51 | 45 |  |  |
Pleural indentation |  |  |  | 12.188 |  < 0.001 |
 Present | 71 | 48 | 23 |  |  |
 Absent | 37 | 12 | 25 |  |  |
Cavitation | Â | Â | Â | 1.463a | 0.339 |
 Present | 97 | 52 | 45 |  |  |
 Absent | 11 | 8 | 3 |  |  |
Lobulation | Â | Â | Â | 6.492 | 0.011 |
 Present | 88 | 54 | 34 |  |  |
 Absent | 20 | 6 | 14 |  |  |
Spiculation | Â | Â | Â | 5.027 | 0.025 |
 Present | 75 | 47 | 28 |  |  |
 Absent | 33 | 13 | 20 |  |  |
Ill-defined peripheral opacity | Â | Â | Â | 0.697 | 0.404 |
 Present | 43 | 26 | 17 |  |  |
 Absent | 65 | 34 | 31 |  |  |