Forest plot of the association between obesity and the rs9939609 polymorphism under per-allele comparison. On the left, the name of the first author of the study is followed by the publication year in parentheses. The size of the black box corresponding to each study is proportional to the sample size, and the horizontal line shows the corresponding 95% CI of the odds ratio (OR). The overall ORs are based on a random-effects model shown by the diamonds. The solid, vertical line represents the null result.
Peng et al. BMC Medicine 2011 9:71 doi:10.1186/1741-7015-9-71