Forrest plot of studies reporting the association of metallothionein staining and tumor grading.

<p>Random effects model used. Relative weight of individual studies displayed in %. For more detailed results see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0085346#pone-0085346-t001" target="_blank">Table 1</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0085346#pone-0085346-t002" target="_blank">2</a>. * indicates studies using Gleason grading. Sorted alphabetically by tumor types. Forrest plot displayed as odds ratio and 95% confidence intervals. Red dashed line indicates the result for all studies together. OR, odds ratio; CI, confidence interval.