Comparison of baseline characteristics
| Recruited patients(n = 425) | Patients not recruited(n = 1007) | |
|---|---|---|
| *Clinical probability was not possible to calculate in 862 patients. | ||
| ‡No white cell count taken on 203 patients. | ||
| §No arterial oxygen value measured for 857 patients. | ||
| ¶No arterial carbon dioxide values measured for 856 patients. | ||
| Age in years (mean (SD)) | 38.3 (15.0) | 40.2 (17.9) |
| Sex (%) | ||
| Men | 48.9 | 49.0 |
| Women | 51.1 | 51.0 |
| Clinical probability of pulmonary embolism (%) | ||
| Low | 86.6 | 84.1* |
| Medium | 10.1 | 13.0* |
| High | 3.3 | 2.8* |
| White cell count, ×109/l (mean (SD)) | 8.9 (3.9) | 9.0×109/L (5.1)‡ |
| Pao2, kPa (mean (SD)) | 11.8 (2.2) | 11.0 (4.5)§ |
| Paco2, kPa (mean (SD)) | 5.1 (0.7) | 5.1 (0.8)¶ |