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Forest plot showing the relative risk (RR) of regular 1-2 cups/day coffee consumption between patients with Alzheimer’s disease and healthy controls. Individual RR and their corresponding 95% confidence intervals (CI) are indicated by filled squares. The size of the square indicates the weight of the study in the random-effect meta-analysis. The summary estimate of RR and its 95% CI are indicated by a diamond.
REML: restricted maximum likelihood.
