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[http://www.ncbi.nlm.nih.gov/pubmed/10052767 Albandar (1999)] reported on data from the Third [[National Health and Nutrition Examination Survey]] (NHANES III). This was derived from a large nationally representative, stratified, multistage [[probability sample]] in the USA comprising 9689 subjects. Pockets > 5mm were found in 7.6% of non-Hispanic white subjects, 18.4% of non-Hispanic black subjects and 14.4% in [[Mexican American]]s; a total of 8.9% of all subjects had pockets > 5mm. Attachment loss > 5mm was found in 19.9% of non-Hispanic white subjects, 27.9% of non-Hispanic black subjects and 28.3% of Mexican Americans; a total of 19.9% of all subjects had attachment loss > 5mm. This suggests that severe periodontitis in not uniformly distributed among various races, ethnicities and socioeconomic groups.
[http://www.ncbi.nlm.nih.gov/pubmed/9696253 Hugoson (1998)] examined three random samples of 600, 597 and 584 subjects in 1973, 1983 and 1993 respectively. These subjects were aged 20–70 years. The severity of disease was divided into five groups, with group 5 having the most severe disease. There was an apparent increase from 1% to 2% to 3% over the three study periods, which may have been due to an increase of [[dentate]] subjects in the older age groups.
Susin 2004 examined a representative sample of 853 dentate individuals in [[Brazil]] who were selected by a multistage probability sampling method. They had a full-mouth clinical examination of six sites per tooth and answered a structured written questionnaire. Seventy-nine percent (79%) and 52% of the subjects and 36% and 16% of the teeth per subject had CAL >5 and >7mm, respectively.
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Eres G et al. (2009). Periodontal treatment needs and prevalence of localized aggressive periodontitis in a young Turkish population. J Periodontol 80, 940-944.
[http://www.ncbi.nlm.nih.gov/pubmed/9696253 Hugoson A et al. (1998). Distribution of periodontal disease in a Swedish adult population 1973, 1983 and 1993. J Clin Perio 25, 542-548.]
Hugoson A et al. (2008). Trends over 30 years, 1973–2003, in the prevalence and severity of periodontal disease. J Clin Perio 35, 405-414.
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