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...Acta psychiatr scand copyright the authors all rights reserved actapsychiatrica doi j x scandinavica review group cognitive behavioural therapy for obsessive compulsive disorder a systematic and meta analysis jonsson h hougaard e nsson department of psychology university aarhus clinic objective behaviour with exposure response prevention hospital risskov denmark erp or cbt including are considered psychological treatments choice ocd but has received relatively little research attention in treatment aim this study was to provide eectiveness erpfor method literature search conducted studies were analysed by means cochrane manager program measures i pre post eect sizes es ii between comparison dierent control conditions outcome primarily measured on y bocs calculated form cohens d results thirteen trials included overall these compared waiting list three randomized controlled indicate that is an eective key words achieved better than pharmacological two one found no signicant dierences hj...