Table 2.
Percentage of patients with high expiratory flows (>95% confidence limit of normal Global Lung Function Initiative reference values)
| Percentage of patients with high expiratory flows | |||||
|---|---|---|---|---|---|
|
| |||||
| All cases (%) | With normal FVC, TLC, and Dlco | ||||
|
| |||||
| Percentage | Normal airway resistance (%) | Normal airway resistance and no emphysema (%) | Nonobese (%) | ||
| FEV1/FVC | 37 | 30 | 50 | 58 | 43 |
| FEF50 | 16 | 13 | 26 | 32 | 29 |
| FEF25–75 | 4 | 6 | 5 | 6 | 10 |
| FEF75 | 4 | 2 | 0 | 1 | 0 |
| PEF | 2 | 4 | 8 | 10 | 14 |
FEV1 = Forced expiratory volume in 1 s, FEF50 = Forced expiratory volume at 50% of FVC, FEF25–75 = Forced expiratory volume at 25%–75% of FVC, FEF75 = Forced expiratory volume at 75% of FVC, GLI = Global Lung Function Initiative, FVC = Forced vital capacity, TLC = Total lung capacity, Dlco = Carbon monoxide diffusing capacity, PEF = Peak expiratory flow