Forest plot of odds ratio (OR) and 95% confidence interval (CI) for each study of the association between the −1131T>C polymorphism and metabolic syndrome risk under dominant model (carriers vs. non-carriers) in meta-analysis.

The squares and horizontal lines correspond to OR and 95% CI for each study, and the area of squares reflects study weight (inverse of the variance). The diamond represents the pooled OR and its 95% CI.