Ziukaite L, et al. - The clinicians performed this systematic review to assess the prevalence of diabetes mellitus in people clinically diagnosed with periodontitis. Compared to people without periodontitis, the overall prevalence and odds of having diabetes were higher within periodontitis populations. Self-reported diabetes underestimated the prevalence when compared to this condition assessed clinically. They observed geographical differences. Studies conducted in Asia had highest diabetes prevalence among subjects with periodontitis. The lowest prevalence was noted in studies originating from Europe.