[Comparability of epidemiologic sample surveys with CPITN].

About 2500 patients each have been examined by an examiner of a definite medical care area or by 27 dentists in all districts of the Dresden county. The results of the age group between 20 and 25 years and 35 and 44 years indicate for both populations a similar course of increasing age-depending degree of severity and an increasing frequency of periodontitis. Differences are significant by grouping into the Code groups 0 and 1. These differences can be explained by a well-aimed prevention in the definite area and an individually lower exploratory capacity of the single examiner.