Interventions for Aboriginal and Torres Strait Islander people with type 2 diabetes that modify its management and cardiometabolic risk factors: a systematic review.

Objectives: To review studies of interventions for reducing the impact of type 2 diabetes in Aboriginal and Torres Strait Islander people. The primary aim was to review and summarise the characteristics and findings of the interventions. The secondary aims were to assess their effects on diabetes and cardiometabolic risk factors, and the proportions of people with type 2 diabetes who achieved therapeutic targets with each intervention.

Study design: We searched eight electronic databases for publications of studies including Aboriginal or Torres Strait Islander people aged 15 years or older with diagnoses of type 2 diabetes, describing one or more diabetes interventions, and published in English during 1 January 2000 - 31 December 2020. Reference lists in the assessed articles were checked for further relevant publications.

Data sources: MEDLINE (Ovid), Web of Science (Clarivate), the Cochrane Library, Global Health (EBSCO), Indigenous Collection and Indigenous Australia (Informit), Cumulative Index to Nursing and Allied Health Literature (CINAHL), and the World Health Organization International Clinical Trials Registry Platform (WHO-ICTRP).

Results: The database searches yielded 1424 unique records; after screening by title and abstract, the full text of 55 potentially relevant articles were screened, of which seventeen met our eligibility criteria: eleven cohort studies (seven retrospective audits and four prospective studies), three randomised controlled trials, and three observational, non-randomised follow-up studies. Twelve publications reported site-based (Aboriginal or Torres Strait Islander health service or diabetes clinic) rather than individual-based diabetes interventions. Interventions with statistically significant effects on mean glycated haemoglobin (HbA_1c) levels were laparoscopic adjustable gastric banding, a 5-day diabetes self-management camp, treatment of Strongyloides stercoralis infections, community-based health worker-led management, point-of-care testing, and self-management approaches.

Conclusions: Few interventions for Aboriginal and Torres Strait Islander people with type 2 diabetes have been reported in peer-reviewed publications. Improving diabetes care services resulted in larger proportions of people achieving therapeutic HbA_1c targets. Outcomes were better when Aboriginal and Torres Strait Islander communities were involved at all levels of an intervention. High quality studies of holistic, culturally safe and accessible interventions should be the focus of research.