A systematic review of factors associated with non-adherence to treatment for immune-mediated inflammatory diseases.

Background: Non-adherence impacts negatively on patient health outcomes and has associated economic costs. Understanding drivers of treatment adherence in immune-mediated inflammatory diseases is key for the development of effective strategies to tackle non-adherence. Objective: To identify factors associated with treatment non-adherence across diseases in three clinical areas: rheumatology, gastroenterology, and dermatology. Design: Systematic review Data sources: Articles published in PubMed, Science Direct, PsychINFO and the Cochrane Library from 1 January 1980 to 14 February 2014. Study selection: Studies were eligible if they included patients with a diagnosis of rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis, inflammatory bowel disease, or psoriasis and included statistics to examine associations of factors with non-adherence. Data extraction: Data were extracted by the first reviewer using a standardised 23-item form and verified by a second/ third reviewer. Quality assessment was carried out for each study using a 16-item quality checklist. Results: 73 studies were identified for inclusion in the review. Demographic or clinical factors were not consistently associated with non-adherence. Limited evidence was found for an association between non-adherence and treatment factors such as dosing frequency. Consistent associations with adherence were found for psychosocial factors, with the strongest evidence for the impact of the healthcare professional-patient relationship, perceptions of treatment concerns and depression, lower treatment self-efficacy and necessity beliefs, and practical barriers to treatment. Conclusions: While examined in only a minority of studies, the strongest evidence found for non-adherence were psychosocial factors. Interventions designed to address these factors may be most effective in tackling treatment non-adherence.