FEV1 | Pre | All | Age, age2, ht, ht2, wt2, gender, smoker | 6 | 127 | 1.63 | 0.004 |
| | Non-smokers | Age, age2, ht, ht2, wt2, gender | 9 | 153 | 1.09 | 0.014 |
| | Smokers | Age, age2, ht, gender | 3 | 241 | 2.74 | <0.001 |
| Post | All | Age, age2, ht, ht2, wt2, gender | 7 | 150 | 2.13 | 0.002 |
| | Non-smokers | Age, age2, ht, ht2, wt2, gender | 7 | 150 | 1.73 | 0.003 |
| | Smokers | Age, age2, ht, gender | 4 | 138 | 2.66 | <0.001 |
FEV1/FVC | Pre | All | Age | 2 | 245 | 1.53 | 0.004 |
| | Non-smokers | Age, ht | 4 | 95 | 1.50 | 0.004 |
| | Smokers | Age, age2 | 9 | 72 | 1.52 | 0.002 |
| Post | All | Age, age2, ht, wt | 7 | 74 | 1.40 | 0.007 |
| | Non-smokers | Age, ht, wt | 18 | 117 | 1.46 | 0.006 |
| | Smokers | Age, age2, packs | 5 | 49 | 3.27 | <0.001 |