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Meta-analysis forest plots of IL-8 levels in the GCF of patients with and without chronic periodontitis. The forest plot is a graphical depiction of the individual results that contributed to meta-analyses. The study results contributing to the meta-analyses were dived into groups according to the unit of measure used in each study. (A) Picograms/μL unit; (B) picograms/site unit. GCF = gingival crevicular fluid, IL-8 = interleukin-8.
