@Article{info:doi/10.2196/13602,
author="Lenhard, Fabian
and Mitsell, Kajsa
and Jolstedt, Maral
and Vigerland, Sarah
and Wahlund, Tove
and Nord, Martina
and Bjureberg, Johan
and Sahlin, Hanna
and Andr{\'e}n, Per
and Aspvall, Kristina
and Melin, Karin
and Mataix-Cols, David
and Serlachius, Eva
and H{\"o}gstr{\"o}m, Jens",
title="The Internet Intervention Patient Adherence Scale for Guided Internet-Delivered Behavioral Interventions: Development and Psychometric Evaluation",
journal="J Med Internet Res",
year="2019",
month="Oct",
day="1",
volume="21",
number="10",
pages="e13602",
keywords="patient compliance; eHealth; measure; internet; cognitive behavioral therapy",
abstract="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. ",
issn="1438-8871",
doi="10.2196/13602",
url="https://www.jmir.org/2019/10/e13602",
url="https://doi.org/10.2196/13602",
url="http://www.ncbi.nlm.nih.gov/pubmed/31573901"
}