Table 1.
Results of univariate analysis of indicated variables in patients with SSNs.
| Pre-invasive/minimally invasive (n = 473) (% or range) | Invasive (n = 337) (% or range) | p | |
|---|---|---|---|
| Age | 51.92 ± 11.79 | 59.55 ± 9.34 | < 0.001 |
| Gender | 0.002 | ||
| Male | 144 (30.4) | 138 (40.9) | |
| Female | 329 (69.6) | 199 (59.1) | |
| Location | 0.176 | ||
| LLL | 67 (14.2) | 30 (8.9) | |
| LUL | 132 (27.9) | 97 (28.8) | |
| RLL | 57 (12.1) | 52 (15.4) | |
| RML | 35 (7.4) | 26 (7.7) | |
| RUL | 182 (38.5) | 132 (39.2) | |
| Tumor size (mm) | 9.00 (7.16–11.05) | 17.18 (13.00–22.22) | < 0.001 |
| Mean CT value (HU) | − 585.94 (− 666.50 to − 491.92) | − 421.79 (− 532.50 to − 285.75) | < 0.001 |
| Size of solid component (mm) | 3.40 (2.56–4.40) | 8.30 (6.42–11.51) | < 0.001 |
| Mean CT value of solid component (HU) | − 328.73 (− 413.50 to − 229.43) | − 158.00 (− 261.03 to − 78.67) | < 0.001 |
| C/T ratio | 0.34 (0.26–0.41) | 0.50 (0.40–0.65) | < 0.001 |
| Pattern | < 0.001 | ||
| pGGN | 304 (64.3) | 64 (19.0) | |
| PSN | 169 (35.7) | 273 (81.0) | |
| Bubble-like sign | 70 (14.8) | 74 (22.0) | 0.009 |
| Air bronchogram | 56 (11.8) | 91 (27.0) | < 0.001 |
| Margin | < 0.001 | ||
| Smooth | 340 (71.9) | 50 (14.8) | |
| Lobular | 71 (15.0) | 99 (29.4) | |
| Spiculated | 43 (9.1) | 84 (24.9) | |
| Lobular + spiculated | 19 (4.0) | 104 (30.9) | |
| Operation type | < 0.001 | ||
| Segmentectomy | 196 (41.4) | 32 (9.5) | |
| Partial resection | 105 (22.2) | 64 (19.0) | |
| Lobectomy | 172 (36.4) | 241 (71.5) | |
C/T ratio ratio of solid component to the whole tumor.