Medication compliance is recognized as a significant challenge in pediatrics.The purpose of this study was to compare inhaled corticosteroid (ICS) persistence in pediatric patients using a single inhaler, containing both an inhaled corticosteroid (fluticasone propionate, FP) and an inhaled long-acting beta-agonist (salmeterol, SAL) (FSC), to patients receiving FP alone, FP + SAL from separate inhalers, or ICS + montelukast (MON).