A Study Measuring Asthma Control In Pediatric And Adolescent Subjects Whose Asthma Is Worsened By Activity Or Exercise

FEV1 is a measure of lung function and is defined as the maximal amount of air that can be forcefully exhaled in one second. Maximal percent change in FEV1 following exercise challenge was defined as the percent change from pre-exercise baseline FEV1 to the minimum FEV1 collected within one hour following exercise challenge. Maximal percent change in FEV1 following exercise challenge was mean maximal percent change from pre-exercise baseline compared between treatment groups at Treatment Week 4. FEV1 was measured 5, 10, 15, 30, and 60 minutes post-exercise. The minimum FEV1 measured across these time points, regardless of any missing time points, will be used for the calculation of maximal percent change.

FEV1 AUC is mean AUC compared between treatment groups at Treatment Day 1. Baseline was defined as the pre-dose FEV1 measure from treatment Day 1. FEV1 AUC was calculated as the area of a trapezoid (calculated as the sum of the bases (top + bottom) divided by 2, then multiplied by width) above the baseline FEV1 area. For participants not completing a serial FEV1 measurement, the last observed post-dose FEV1 measurement was carried forward.

PEF is defined as the maximum airflow during a forced expiration beginning with the lungs fully inflated. PEF was measured by the participants using a hand-held electronic peak flow meter each morning prior to the dose of study medication and any rescue albuterol/salbutamol inhalation aerosol use. Each participant was instructed to perform triplicate PEF measurements in the morning. Change from baseline was calculated as the endpoint value minus the baseline value. For AM PEF, baseline was defined as the average of the AM PEF values recorded on the day of Visit 2 (7-14 [+ or -4] days after Visit1) plus the 6 preceding days since AM PEF was measured in the morning.

PEF is defined as the maximum airflow during a forced expiration beginning with the lungs fully inflated. PEF was measured by the participants using a hand-held electronic peak flow meter each evening prior to the dose of study medication after the symptom measurement and any rescue albuterol/salbutamol inhalation aerosol use. Each participant was instructed to perform triplicate PEF measurements in the evening. Change from baseline was calculated as the endpoint value minus the baseline value. Baseline was defined as the average of the values from the 7 days preceding Visit 2 (7-14 [+ or -4] days after Visit1) since these measures were derived from data collected in the evening.

A rescue-free day was defined as a day when no supplemental albuterol was taken (i.e., 0 puffs recorded for both AM and PM assessments of albuterol use in the daily diary). Percent of rescue-free days was calculated as the number of rescue-free days, divided by the total number of days in the treatment period, multiplied by 100 for each participant.

A symptom-free day was defined as a day with no symptoms (i.e., a score of 0, indicating no asthma symptoms during the day or previous night, recorded in the daily diary). Percent of symptom-free days was calculated as the number of symptom-free days, divided by the total number of days in the treatment period, multiplied by 100 for each participant.

PAQLQ measures functional problems that are most troublesome to children with asthma. PAQLQ has 23 questions in 3 domains (activity limitation=5, emotional function=8, symptoms=10). Participants responded to each question on a 7-point scale (7= not bothered at all and 1= extremely bothered). The overall PAQLQ score is the mean of all 23 responses (minimum score 1= 5+8+10/23 and maximum score 7= 35+56+70/23) and the individual domain scores are the means of the items in those domains (minimum: 5/5, 8/8, 10/10 and maximum: 35/5, 56/8, 70/10). Minimum possible value is 1 (maximum impairment); maximum possible value is 7 (no impairment). Endpoint was defined from the last questionnaire collected during the double-blind treatment period or discontinuation visit (up to Week 4).