Table 2. Preoperative clinical characteristics before and after PSM.
| Characteristics | Primary cohort | PSM cohort | |||||
|---|---|---|---|---|---|---|---|
| Non-PPC (n=314) | PPC (n=142) | P value | Non-PPC (n=135) | PPC (n=135) | P value | ||
| Pre-ALB (g/L) | 0.04 | 0.69 | |||||
| <45 | 90 (28.7) | 54 (38.0) | 44 (32.6) | 48 (35.6) | |||
| ≥45 | 224 (71.3) | 88 (62.0) | 91 (67.4) | 87 (64.4) | |||
| FVC | 0.001 | 0.21 | |||||
| <80% | 95 (30.3) | 66 (46.5) | 49 (36.3) | 59 (43.7) | |||
| ≥80% | 219 (69.7) | 76 (53.5) | 86 (63.7) | 76 (56.3) | |||
| FEV1 | 0.005 | 0.58 | |||||
| <80% | 64 (20.4) | 46 (32.4) | 35 (25.9) | 39 (28.9) | |||
| ≥80% | 250 (79.6) | 96 (67.6) | 100 (74.1) | 96 (71.1) | |||
| FEV1/FVC | 0.014 | 0.41 | |||||
| <80% | 66 (21.0) | 45 (31.7) | 35 (25.9) | 41 (30.4) | |||
| ≥80% | 248 (79.0) | 97 (68.3) | 100 (74.1) | 94 (69.6) | |||
| DLCO | 0.07 | 0.65 | |||||
| <80% | 51 (16.2) | 33 (23.2) | 27 (20.0) | 31 (23.0) | |||
| ≥80% | 263 (83.8) | 109 (76.8) | 108 (80.0) | 104 (77.0) | |||
Data are presented as n (%). PSM, propensity score matching; PPC, postoperative pulmonary complication; Pre-ALB, pre-albumin; FVC, forced vital capacity; FEV1, forced expiratory volume in the first second; DLCO, diffusing capacity of the lungs for carbon monoxide.