| Pre operative | Bilaterial LVRS Mean(SD)n=23 | Unilaterial LVRS Mean(SD)n=81 | Bullectomy Mean(SD)n=20 | Brompton (Intracavity drainage and pleurodesis) Mean (SD)n=14 |
| Age | 57.9(5.2) | 57.32(10.1) | 49.2(12.1) | 59.5(8.0) |
| Male % | 91.3 | 74.1 | 75 | 85.7 |
| FEV1%pred | 25.9(12.1) | 35.8(14.8) | 51.4(20.2) | 32.5(8.12) |
| FVC%pred | 77.2(18.1) | 84.5(19.4) | 77.7(20.9) | 76.9(23.7) |
| RV/TLC % | 65.0(7.86) | 58.4(10.5) | 54.4(10.1) | 61(10.4) |
| DLCOc%pred | 65.0(7.86) | 39.8(15.8) | 55.0(20.3) | 42.1(15.8) |