Table 5. Comparison of characteristics between IA and AIS/MIA.
| Characteristics | AIS/MIA group (n=39) | IA group (n=28) | P value |
|---|---|---|---|
| Age (year)* | 56.13±11.74 | 56.29±11.24 | 0.956 |
| Nodule size (mm)* | 10.79±5.42 | 16.16±9.16 | 0.004 |
| Female sex | 26 (66.67%) | 18 (64.29%) | 0.840 |
| Ever-smoker | 4 (10.26%) | 5 (17.86%) | 0.368 |
| ≥10 mm | 17 (43.59%) | 21 (75%) | 0.010 |
| PSN | 9 (23.08%) | 19 (67.86%) | <0.001 |
| Air bronchogram | 28 (71.79%) | 27 (96.43%) | 0.009 |
| Ill-defined margin | 14 (35.90%) | 12 (42.86%) | 0.564 |
| Lobulation | 9 (23.08%) | 13 (46.43%) | 0.045 |
| Pleural tail | 10 (25.64%) | 21 (75%) | <0.001 |
| Spiculation | 13 (33.33%) | 16 (57.14%) | 0.052 |
*, data presented as mean ± standard deviation. n, number of cases; AIS, adenocarcinoma in situ; MIA, minimally invasive adenocarcinoma; IA, invasive adenocarcinoma; PSN, part-solid nodule.