Assessment of asthma control
The respiratory control of patients was assessed with the 5-item, caregiver-completed test for Respiratory and Asthma Control in Kids (TRACK). It includes frequency of respiratory symptoms (wheeze, cough, shortness of breath), activity limitation, and night-time awakenings in the past 4 weeks, rescue medication use in the past 3 months, and oral corticosteroid use in the previous year [28]. A total score of less than 80 suggests a suboptimal respiratory control status [29].