[Validity and quality criteria of the efficiency parameter "quantity of dental services"]

The validity of the efficiency parameter "quantity of dental services" (as developed by Diettrich and Uhlig) was examined by means of discriminating work analyses in dentist-nurse collectives and by comparison of the values of this parameter in the course of several 6-month periods. The statistical evaluation (significance tests, correlation analysis) of the quality criteria (objectivity, reliability, validity) as precision conditions of any specific measuring method showed that the present efficiency parameter complies with the above-mentioned criteria and that it may be used, with due regard to its limitations, as a reliable tool for accounting and managing in stomatology.