Jim McCambridge|Maria Day|Bonnita A. Thomas|John Strang
London School of Hygiene & Tropical Medicine|Faculty of Public Health|King's College London|King's College London|King's College London|King's College London
study tested whether differences cannabis cessation 3 months single session motivational interviewing mi may attributable fidelity mi audiorecordings necessary 3month followup data n75 delivered four individual practitioners within randomised controlled trial rct used participants weekly frequent cannabis users aged 1619 years old education colleges tapes coded motivational interviewing treatment integrity miti scale version 2 2 coders satisfactory interrater reliability achieved differences within practitioners fidelity mi consistently detected controlling practitioner effects motivational interviewing spirit proportion complex reflections independently predictive cessation outcome aspects fidelity associated outcome two particular aspects enhanced fidelity mi predictive subsequent cannabis cessation 3 months brief intervention among young cannabis users