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  • Title: [Further results from the Berlin morbidity study 1972. 2. Educational level and incidence of periodontal diseases].
    Author: Schneider HG, Graehn G, Mayrock B, Schirmer I.
    Journal: Stomatol DDR; 1979 Jun; 29(6):469-74. PubMed ID: 291194.
    Abstract:
    The ratio of subjects without periodontal diseases to those with periodontal diseases is 40:60 for individuals having gained a primary school-leaving certificate, and 53:47 for individuals with higher educational level.
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