 - Demonstration of a diurnal variation PEF of more than 20 based on the difference between the prebronchodilator before taking albuterolsalbutamol morning value and the postbronchodilator value after taking albuterolsalbutamol from the evening before, expressed as a percentage of the mean daily PEF value on any day during the open-label Run-in Period. The calculation formula: Diurnal PEF Variation Absolute highest of 3 readings, PM Post-bronchodilator BD PEF from prior evening - highest of 3 readings, AM Pre-BD from morning valuehighest PM Post-BD highest AM Pre-BD2 100 