| Quartiles | FEV1 | 95%CI | FVC | 95%CI |
---|---|---|---|---|---|
Level at entry into program (ml) | Q1 | 0 | Â | 0 | Â |
 | Q2 | 5.5 | -15.5,26.6 | -8.9 | -35.8,17.9 |
 | Q3 | 4.4 | -19.8,28.7 | 6.6 | -24.4,37.6 |
 | Q4 | 2.6 | -25.5,30.9 | -16.8 | -52.7,19.1 |
Annual change (ml/year) | Q1 | 0 | Â | 0 | 0 |
 | Q2 | 4.1 | -1.8,10.1 | 10.3 | 2.7,17.9 |
 | Q3 | 7.1 | 1.0,13.4 | 11.1 | 3.2,19.1 |
 | Q4 | 11.3 | 4.8,17.7 | 18.6 | 2.7,10.3 |