%0 Journal Article
%@ 1438-8871
%I JMIR Publications
%V 21
%N 10
%P e13602
%T The Internet Intervention Patient Adherence Scale for Guided Internet-Delivered Behavioral Interventions: Development and Psychometric Evaluation
%A Lenhard,Fabian
%A Mitsell,Kajsa
%A Jolstedt,Maral
%A Vigerland,Sarah
%A Wahlund,Tove
%A Nord,Martina
%A Bjureberg,Johan
%A Sahlin,Hanna
%A Andrén,Per
%A Aspvall,Kristina
%A Melin,Karin
%A Mataix-Cols,David
%A Serlachius,Eva
%A Högström,Jens
%+ Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, & Stockholm Health Care Services, Stockholm County Council, CAP Research Centre, Gävlegatan 22, SE-113 30, Stockholm,, Sweden, 46 8 514 522 12, fabian.lenhard@ki.se
%K patient compliance
%K eHealth
%K measure
%K internet
%K cognitive behavioral therapy
%D 2019
%7 1.10.2019
%9 Original Paper
%J J Med Internet Res
%G English
%X Background: 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. Objective: The objective of this study was to develop and psychometrically evaluate a novel measure of adherence to guided internet-delivered behavioral interventions. Methods: 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. Results: 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. Conclusions: The iiPAS could be a useful tool to measure adherence in a broad range of internet-delivered behavioral interventions. 
%M 31573901
%R 10.2196/13602
%U https://www.jmir.org/2019/10/e13602
%U https://doi.org/10.2196/13602
%U http://www.ncbi.nlm.nih.gov/pubmed/31573901