The recent Cochrane review  used courses of OCS as a primary outcome measure; however, evidence points to the ineffectiveness of OCS in preschool wheeze. Therefore, by using this as an outcome measure, subtle changes in outcome may not be picked up, due to inconsistencies of prescribing across healthcare professionals. The use of corticosteroids in this group of children may vary from clinician to clinician, whereas the frequency of wheezing episodes is more accurate and clinically applicable.