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Summary estimates of the association between the APOE ϵ4 mutation (ϵ3/ϵ4+ϵ4/ϵ4 vs. ϵ3/ϵ3) and the risk of coronary artery diseases in type 2 diabetes patients. Each study is displayed by a square whose center represents the odds ratio (OR), the area of the square is proportional to the weight of studies, and the horizontal line indicates the 95% confidence interval (CI).
