TABLE 4.
Severity on the basis of inhaled corticosteroid dose and spirometry
| Inhaled corticosteroid (beclomethasone equivalent), μg/day | n | FEV1%* (mean ± SD) | FEV1/FVC%* (mean ± SD) |
|---|---|---|---|
| 0 | 140 | 82±19.7 | 72±11.1 |
| 1–500 | 150 | 80±20.2 | 71±12.1 |
| 501–1000 | 166 | 81±21.2 | 73±11.8 |
| >1000 | 44 | 75±20.9 | 70±14.6 |
*
There was no significant difference in the forced expiratory volume in 1 s (FEV1)% (10) or FEV1/forced vital capacity (FVC)% among the four categories of inhaled corticosteroid use (P=0.3). FEV1% is the FEV1 expressed as a percentage of predicted; FEV1/FVC% is the ratio of FEV1 and FVC expressed as a percentage