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Forest plot (random-effects model) of lung cancer risk associated with EPHX1 rs2234922 polymorphism for (A/G + G/G) versus A/A. Each box represents the OR point estimate, and its area is proportional to the weight of the study. The diamond (and broken line) represents the overall summary estimate, with CI represented by its width. The unbroken vertical line is set at the null value (OR =1.0). EPHX1, epoxide hydrolase 1; OR, odds ratio; CI, confidence interval.
