TABLE 6.
Baseline Characteristics in the Propensity Matched Cohort
| Major Abdominal Surgery (N=2974) | Craniotomy (N=2974) | |
|---|---|---|
| Demographic characteristics | ||
| Sex, male, n (%) | 1385 (46.5%) | 1382 (46.5%) |
| Age (years), mean±SD | 54.7±16.1 | 54.9±15.6 |
| Category of body mass index (kg/m2), n (%) | ||
| 1 | 68 (2.3) | 16 (1.4) |
| 2 | 1149 (38.6) | 333 (29.9) |
| 3 | 979 (32.9) | 404 (36.3) |
| 4 | 487 (16.4) | 199 (17.9) |
| 5 | 291 (9.8) | 160 (14.4) |
| Comorbidities | ||
| Charlson Comorbidity Index, mean ± SD | 3.0±3.2 | 3.0±3.2 |
| Existing chronic pulmonary disease, n (%) | 367 (12.3) | 368 (12.4) |
| Score for prediction of postoperative respiratory complications, mean ± SD | 1.6±1.9 | 3.6±1.9 |
| Emergency/urgent, n (%) | 233 (7.8) | 227 (7.6) |
| Intraoperative factors | ||
| Median PEEP (cmH2O), n (%) | ||
| <5 | 1108 (37.3) | 1111 (37.4) |
| 5 | 1484 (49.9) | 1476 (49.6) |
| >5 | 382 (12.8) | 387 (13.0) |
| Median plateau pressure (cmH2O), mean±SD | 17.8±4.0 | 18.2±3.8 |
| Total resuscitation volume (mL), mean ± SD | 3104±2,118 | 2794±5,515 |
| Platelets transfused (units), mean±SD | 0.04±0.5 | 0.05±0.6 |
| Fresh frozen plasma transfused (units), mean ± SD | 0.03±0.4 | 0.02±0.3 |
| Packed red blood cells transfused (units), mean ± SD | 0.08±0.5 | 0.07±0.4 |
| Duration of intraoperative ventilation (hours), mean ± SD | 4.9±1.9 | 4.7±2.4 |