Figure 1.

Forest (left) and funnel (right) plots of the mean differences in global gray matter volume between patients with obsessive-compulsive disorder and healthy controls (using a random-effects model). On the funnel plot, the included studies appear to be symmetrically distributed on either side of the mean difference, suggesting no publication bias towards positive or negative studies.

Radua and Mataix-Cols Biology of Mood & Anxiety Disorders 2012 2:6   doi:10.1186/2045-5380-2-6
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