TY  - JOUR
AU  - Lenhard, Fabian
AU  - Mitsell, Kajsa
AU  - Jolstedt, Maral
AU  - Vigerland, Sarah
AU  - Wahlund, Tove
AU  - Nord, Martina
AU  - Bjureberg, Johan
AU  - Sahlin, Hanna
AU  - Andrén, Per
AU  - Aspvall, Kristina
AU  - Melin, Karin
AU  - Mataix-Cols, David
AU  - Serlachius, Eva
AU  - Högström, Jens
PY  - 2019
DA  - 2019/10/1
TI  - The Internet Intervention Patient Adherence Scale for Guided Internet-Delivered Behavioral Interventions: Development and Psychometric Evaluation
JO  - J Med Internet Res
SP  - e13602
VL  - 21
IS  - 10
KW  - patient compliance
KW  - eHealth
KW  - measure
KW  - internet
KW  - cognitive behavioral therapy
AB  - 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. 
SN  - 1438-8871
UR  - https://www.jmir.org/2019/10/e13602
UR  - https://doi.org/10.2196/13602
UR  - http://www.ncbi.nlm.nih.gov/pubmed/31573901
DO  - 10.2196/13602
ID  - info:doi/10.2196/13602
ER  -