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The Internet Intervention Patient Adherence Scale for Guided Internet-Delivered Behavioral Interventions: Development and Psychometric Evaluation.

Journal article
Authors Fabian Lenhard
Kajsa Mitsell
Maral Jolstedt
Sarah Vigerland
Tove Wahlund
Martina Nord
Johan Bjureberg
Hanna Sahlin
Per Andrén
Karin Melin
Kristina Aspvall
David Mataix-Cols
Eva Serlachius
Jens Högström
Published in Journal of medical Internet research
Volume 21
Issue 10
ISSN 1438-8871
Publication year 2019
Published at Institute of Neuroscience and Physiology
Language en
Links dx.doi.org/10.2196/13602
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Child and adolescent psychiatry

Abstract

Patient adherence is defined as the extent to which a patient complies with medical or health advice. At present, there is a lack of reliable and valid measures specifically designed to measure adherence to internet-delivered behavioral interventions.The objective of this study was to develop and psychometrically evaluate a novel measure of adherence to guided internet-delivered behavioral interventions.In collaboration with experienced clinicians and researchers in the field, a 5-item, clinician-rated internet intervention Patient Adherence Scale (iiPAS) was developed. The initial scale was tested in a sample of children and adolescents (N=50) participating in internet-delivered cognitive behavioral therapy (ICBT) studies. A revised version of the iiPAS was then administered to a larger sample of children and adolescents (N=148) with various behavioral problems participating in ICBT trials. The scale was evaluated according to a classical test theory framework.The iiPAS demonstrated excellent internal consistency. Factor analyses revealed one underlying factor, explaining about 80% of the variance, suggesting that the scale captures a homogeneous adherence construct. The iiPAS was strongly associated with objective measures of patient activity in ICBT (number of logins, number of written characters, and completed modules). Furthermore, mid- and posttreatment ratings of the iiPAS were significantly correlated with treatment outcomes. By contrast, objective measures of patient activity in the Web-based platform did not correlate with treatment outcomes.The iiPAS could be a useful tool to measure adherence in a broad range of internet-delivered behavioral interventions.

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