1.
两组患者基线资料
Baseline characteristics
| Characteristics | Non-PCs | PCs | P |
| SD: standard deviation; FEV1: forced expiratory volume in one second; FVC: forced vital capacity; MVV: maximum ventilatory volume; DLco: diffusion capacity for carbon monoxide of the lung; COPD: chronic obstructive pulmonary disease. | |||
| Number | 821 (85.0%) | 145 (15.0%) | |
| Age (Mean±SD) | 58.8±9.2 | 60.2±10.1 | 0.048 |
| Gender | 0.452 | ||
| Men | 569 (74.7%) | 105 (72.4%) | |
| Female | 252 (25.3%) | 40 (27.6%) | |
| Smoking history | 0.712 | ||
| Never | 286 (34.8%) | 55 (37.9%) | |
| Current or former | 535 (63.2%) | 90 (62.1%) | |
| Preoperative FEV1(L) | 2.5±0.18 | 2.07±0.22 | 0.001 |
| Preoperative FVC (L) | 3.2±0.84 | 3.27±0.76 | 0.771 |
| Preoperative MVV (L/min) | 96.7±24.1 | 96.4±26.4 | 0.821 |
| Preoperative DLco (mL/min/mmHg) | 24.1±4.7 | 20.3±3.9 | < 0.001 |
| Pathological type | < 0.001 | ||
| Adenocarcinoma | 576 (70.1%) | 96 (66.2%) | |
| Squamous carcinoma | 198 (24.1%) | 40 (27.6%) | |
| Other | 47 (5.8%) | 9 (6.2%) | |
| Preoperative comorbidities | |||
| COPD | 22 (2.6%) | 70 (48.3%) | < 0.001 |
| Diabetes mellitus | 35 (4.2%) | 14 (9.7%) | 0.006 |
| Hypertension | 22 (2.6%) | 15 (10.3%) | < 0.001 |
| Clinical stage | 0.753 | ||
| Stage Ⅰ or 0 | 535 (65.2%) | 90 (62.1%) | |
| Stage Ⅱ | 227 (27.6%) | 41 (28.3%) | |
| Stage Ⅲ | 51 (6.2%) | 12 (8.3%) | |
| Stage Ⅳ | 8 (1.0%) | 2 (1.3%) | |