“…Trials ultimately selected for review can be divided into those utilizing a monofaceted, dust avoidance, approach: Prevention and Incidence of Asthma and Mite Allergy (PIAMA) (12,(17)(18)(19)(20)(21)(22), Childhood Asthma Prevention Study (CAPS) (14,(23)(24)(25)(26)(27), and the National Asthma Campaign Manchester Asthma and Allergy Study ( NAC MASS) (15,(28)(29)(30)(31), and those using a multifaceted allergen avoidance approach: Isle of Wight prevention study (10,(32)(33)(34)(35)(36)(37), Canadian Asthma Primary Prevention Study (CAPPS) (11,(38)(39)(40)(41), Study of Prevention of Allergy in Children of Europe (SPACE) (13,42,43), and the Prevention of Asthma in Children (PREVASC) (16,(44)(45)(46)(47). Studies using a monofaceted dust avoidance approach were combined in a meta-analysis, while studies using a multifaceted approach were deemed too heterogeneous to be combined.…”