Bronchoalveolar lavage cytology in 2019 and 2020
| Year | N | Caseload positive for malignancy (% (n)) | P value for difference in proportions of malignant cases between years | OR (95% CI) |
| 2020 | 172 | 11.6% (n=20) | 0.277 | 1.397 (0.779 to 2.505) |
| 2019 | 395 | 8.6% (n=34) |