Figure 2
From: CYP1A1 MspI and exon7 gene polymorphisms and lung cancer risk: An updated meta-analysis and review
Forest plot (random-effects model) of lung cancer risk associated with CYP1A1 MspI for the combined types B and C vs Type 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).