[Efficacy of child and adolescent health protection in a district--approaches for studying the effectiveness].

The evaluation of the effectiveness of medical in particular preventive measures is an essential prerequisite for the determination of the priorities in the further improvement of medical care conceptions taking into account practical demands. Endeavours to define the terms of quality and effectiveness prove the difficulty of the problem. The description of approaches allows to deduce investigation approaches to judgements on the individual and collective state of health, and to coordinative and cooperative correlations in the medical care for children and adolescents for the purpose of optimizing a health care model on district level.