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Assessment of motivational interviewing: Psychometric characteristics of the MITS 2.1 in general practice
Affiliation:1. Department of General Practice/ Family Medicine, Amsterdam UMC, Location AMC, University of Amsterdam, Meibergdreef 15, 1105 AZ, Amsterdam, the Netherlands;2. Department of Psychology, University of Amsterdam, the Netherlands;1. US Department of Veterans Affairs Health Services Research and Development Center for Health Information and Communication, Roudebush VA Medical Center, Indianapolis, IN, USA;2. Regenstrief Institute, Indianapolis, IN, USA;3. Department of Communication Studies, Indiana University-Purdue University, Indianapolis, IN, USA;4. Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA;5. Department of Biostatistics, Indiana University School of Medicine, Indianapolis, IN, USA;6. Department of Psychology, Indiana University-Purdue University, Indianapolis, IN, USA;1. Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, South Australia, Australia;2. Stroke Research Programme, University of Adelaide School of Medicine, South Australian Health and Medical Research (SAHMRI), Adelaide, South Australia, Australia;3. Department of Neurology, Royal Adelaide Hospital, Adelaide, South Australia, Australia;1. Faculty of Nursing, School of Health Sciences, Univeresity of Iceland, Reykjavik, Iceland;2. Landspitali, the National University Hospital of Iceland, Reykjavik, Iceland;3. Department of Cardiology and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden;4. Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;5. Department of Medicine, Geriatrics and Emergency Care, Sahlgrenska University Hospital, Gothenburg, Sweden;6. Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden;7. Julius Center, University Medical Center, Utrecht, the Netherlands
Abstract:ObjectiveMotivational Interviewing (MI) is increasingly used in healthcare. The Motivational Interviewing Target Scheme 2.1 (MITS) can be used to assess MI in short consultations. This quantitative validation study is a sequel to a qualitative study, which showed that the MITS is suitable for low-stakes assessment. We collected validity evidence to determine whether its suitability for high-stakes assessment in the GP-setting.MethodsConsultations of GPs and GP-trainees were assessed using the MITS. The internal structure was studied using generalizability theory; intra class correlation (ICC), convergent and divergent validity was determined.ResultsTwo coders and seven consultations were found to be necessary for high stakes assessment. We found higher ICCs as coders were more experienced. Convergent validity was found; results for divergent validity were mixed.ConclusionThe MITS is a suitable instrument for high-stakes MI assessments in GP-setting. The number of consultations and coders that are needed for assessment are comparable to other instruments for assessing communication skills.Practice implicationsThe MITS can be used to assess conversations for their MI consistency in GP-setting where most consultations are relatively short and are only partially dedicated to behaviour change. As the MITS assesses complex communication skills, experienced coders are needed.
Keywords:Motivational Interviewing  Assessment  Validation  General practice  Health care  High stakes assessment  Selective assessment  Complex communication skills
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