Mean (SD) period differences in prebronchodilator PEFR
| Group | Change in PEFR during period 1 (l/min) | Change in PEFR during period 2 (l/min) | Change in PEFR during period 3 (l/min) |
|---|---|---|---|
| I | 85 (68) | 27 (62) | 12 (56) |
| II | 86 (81) | 53 (73) | 5 (47) |
| III | 90 (100) | 50 (69) | 16 (42) |