Table 3.
Proportion of never-smokers (as compared to ex-smokers/smokers) at entry, summarized by baseline diagnosis and by medication level
| Characteristic | Medication Level | Asthma (n=25959) | COPD (n=21012) | Mixed disease (n=5501) | Other (n=7536) |
|---|---|---|---|---|---|
| Proportion (%) of non-smokers | 1 | 13.8 | 9.3 | 11.0 | 12.6 |
| 2 | 18.3 | 7.8 | 15.3 | 13.2 | |
| 3 | 19.3 | 9.9 | 13.3 | 17.5 | |
| 4 | 20.7 | 7.0 | 11.3 | 14.4 | |
| 5 | 23.0 | 9.3 | 22.6 | 18.5 | |
| Mean FEV1 (L) | 1 | 1.66 | 1.35 | 1.40 | 1.61 |
| 2 | 1.70 | 1.22 | 1.39 | 1.60 | |
| 3 | 1.65 | 1.24 | 1.43 | 1.49 | |
| 4 | 1.51 | 1.00 | 1.29 | 1.36 | |
| 5 | 1.41 | 1.09 | 1.26 | 1.22 | |
| Proportion (%) with change in diagnosis | 1 | 56.7 | 16.7 | 53.5 | 60.8 |
| 2 | 49.9 | 10.6 | 49.2 | 67.5 | |
| 3 | 51.4 | 15.2 | 44.7 | 69.1 | |
| 4 | 60.1 | 7.7 | 43.9 | 72.8 | |
| 5 | 63.4 | 13.8 | 41.8 | 64.6 |