Table 1.
Patient demographics
| Variablea | Non-emphysema (n = 301) | Emphysema (n = 63) | P |
|---|---|---|---|
| Sex | |||
| Male | 169 (56.1) | 54 (85.7) | < 0.001 |
| Female | 132 (43.9) | 9 (14.3) | |
| Age (y) | 69.0 ± 8.2 | 71.2 ± 8.0 | 0.049 |
| BMI (kg/m2) | 22.3 ± 2.9 | 21.2 ± 2.9 | 0.006 |
| Smoking index | 565.4 ± 650.4 | 1305.4 ± 719.1 | < 0.001 |
| VC (%) | 105.0 ± 62.0 | 101.7 ± 18.1 | 0.633 |
| FEV1/FVC (%) | 76.2 ± 8.6 | 67.6 ± 12.9 | < 0.001 |
| COPD | < 0.001 | ||
| No | 243 (80.7) | 27 (42.9) | |
| Yes | 58 (19.3) | 36 (57.1) | |
| Surgical procedure | 0.798 | ||
| Sublobar resection | 119 (39.5) | 26 (41.3) | |
| Lobectomy | 182 (60.5) | 37 (58.7) | |
| Tumor size (mm) | 22.6 ± 9.8 | 25.9 ± 11.5 | 0.038 |
| Histology | < 0.001 | ||
| Adenocarcinoma | 250 (83.0) | 33 (52.4) | |
| Squamous cell carcinoma | 37 (12.3) | 26 (41.3) | |
| Other | 14 (4.6) | 4 (6.3) | |
| Histologic grade | 0.001 | ||
| Well differentiated | 159 (52.8) | 18 (28.6) | |
| Moderately differentiated | 107 (35.6) | 31 (49.2) | |
| Poorly differentiated | 35 (11.6) | 14 (22.2) | |
| Pleural invasion | < 0.001 | ||
| Absent | 226 (75.1) | 33 (52.4) | |
| Present | 75 (24.9) | 30 (47.6) | |
BMI Body mass index, VC vital capacity, FEV1 forced expiratory volume in 1 s; FVC forced vital capacity
aCategorical data are expressed as numbers, and continuous data are expressed as means ± standard deviation