Figure 4. Forrest plot of studies reporting the association of metallothionein staining and tumor grading.

Random effects model used. Relative weight of individual studies displayed in %. For more detailed results see Table 1 and 2. * 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.