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Aims: This study aimed to systematically evaluate the effectiveness of patient decision aids on knowledge, decisional conflict and decisional self-efficacy outcomes in patients with diabetes.

Methods: A comprehensive database search was performed using the Web of Science, Cochrane Library, PubMed, Embase, PsycINFO (Ovid), CINAHL (EBASCO), CNKI, VIP, Wan Fang Database and the Ottawa Decision Aid Library Inventory (http://decisionaid.ohri.ca/index.html) from inception to 13 October 2019. Two reviewers independently searched databases, screened articles, extracted data and evaluated the risk bias of included studies. Then Rev Man 5.3 software was adopted for statistical analysis.

Results: Ten articles containing 1,452 people with diabetes were selected. The results of meta-analysis showed that patient decision aids had a positive effect on reducing decisional conflict and improving decisional self-efficacy among patients with type 2 diabetes. Meanwhile, this article also revealed that patient decision aids have beneficial short-term effects on improving knowledge, but there was no significant long-term effect.

Conclusion: Patient decision aids are capable of becoming support tools to improve shared decision making. Further implementation studies are required to transform patient decision aids tools into clinical practice.