Forest plot of estimates of association between bacterial vaginosis and cervical human papillomavirus infection. Studies are identified by references. Each study is represented by a black square and a horizontal line, which corresponds to the estimate (ES) and 95% confidence interval (CI) of odds ratios. Area of black squares reflects weight of study in the meta-analysis.
Gillet et al. BMC Infectious Diseases 2011 11:10 doi:10.1186/1471-2334-11-10