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Intentional and Unintentional Medication Non-Adherence in Psoriasis: The Role of Patients' Medication Beliefs and Habit Strength

Thorneloe, Rachael J.; Griffiths, Christopher E.M.; Emsley, Richard; Ashcroft, Darren M.; Cordingley, Lis; Biologic Interventions Register, British Association of Dermatologists; Barker, Jonathan; Benham, Marilyn; Burden, David; Evans, Ian; Griffiths, Christopher; Hussain, Sagair; Kirby, Brian; Lawson, Linda; Mason, Kayleigh; McElhone, Kathleen; Murphy, Ruth; Ormerod, Anthony; Owen, Caroline; Reynolds, Nick; Smith, Catherine; Warren, Richard; Relevant Therapy Study Groups, Psoriasis Stratification to Optimise; Barker, Jonathan; Barnes, Michael; Burden, David; Emsley, Richard; Griffiths (Chair), Christopher; Payne, Katherine; Reynolds, Nick; Ryder, Samantha; Smith, Catherine; Stocken, Deborah; Warren, Richard

Intentional and Unintentional Medication Non-Adherence in Psoriasis: The Role of Patients' Medication Beliefs and Habit Strength Thumbnail


Rachael J. Thorneloe

Christopher E.M. Griffiths

Richard Emsley

Darren M. Ashcroft

Lis Cordingley

British Association of Dermatologists Biologic Interventions Register

Jonathan Barker

Marilyn Benham

David Burden

Ian Evans

Christopher Griffiths

Sagair Hussain

Brian Kirby

Linda Lawson

Kathleen McElhone

Ruth Murphy

Anthony Ormerod

Caroline Owen

Nick Reynolds

Catherine Smith

Richard Warren

Psoriasis Stratification to Optimise Relevant Therapy Study Groups

Jonathan Barker

Michael Barnes

David Burden

Richard Emsley

Christopher Griffiths (Chair)

Katherine Payne

Nick Reynolds

Samantha Ryder

Catherine Smith

Deborah Stocken

Richard Warren


Medication non-adherence is a missed opportunity for therapeutic benefit. We assessed "real-world" levels of self-reported non-adherence to conventional and biologic systemic therapies used for psoriasis and evaluated psychological and biomedical factors associated with non-adherence using multivariable analyses. Latent profile analysis was used to investigate whether patients can be categorized into groups with similar medication beliefs. Latent profile analysis categorizes individuals with similar profiles on a set of continuous variables into discrete groups represented by a categorical latent variable. Eight hundred and eleven patients enrolled in the British Association of Dermatologists Biologic Interventions Register were included. Six hundred and seventeen patients were using a self-administered systemic therapy; 22.4% were classified as "non-adherent" (12% intentionally and 10.9% unintentionally). Patients using an oral conventional systemic agent were more likely to be non-adherent compared to those using etanercept or adalimumab (29.2% vs. 16.4%; P = 0.001). Latent profile analysis supported a three-group model; all groups held strong beliefs about their need for systemic therapy but differed in levels of medication concerns. Group 1 (26.4% of the sample) reported the strongest concerns, followed by Group 2 (61%), with Group 3 (12.6%) reporting the weakest concerns. Group 1 membership was associated with intentional non-adherence (odds ratio = 2.27, 95% confidence interval = 1.16-4.47) and weaker medication-taking routine or habit strength was associated with unintentional non-adherence (odds ratio = 0.92, 95% confidence interval = 0.89-0.96). Medication beliefs and habit strength are modifiable targets for strategies to improve adherence in psoriasis.

Journal Article Type Article
Acceptance Date Nov 3, 2017
Online Publication Date Nov 26, 2017
Publication Date 2018-04
Publicly Available Date May 26, 2023
Journal Journal of Investigative Dermatology
Print ISSN 0022-202X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 138
Issue 4
Pages 785 - 794
Publisher URL