[Relationship between diagnostic parameters and epidemiological findings in periodontology].

Numerous epidemiologic studies performed in the People's Republic of Poland during the years 1966-1975 make evident that the morbidity of periodontal diseases in children and adolescents, 7-18 years of age, varies from 5.5 to 66.6%. But the results from these studies could not be compared with each other, because there were considerable differences in group sizes, methods (as to indices) and the examinators' special training for epidemiologic investigations.