[On the epidemiology of recurrent and chronic bronchopulmonary diseases -- an examination of about 18,000 children. 6th report: summary of the investigation in the four districts (author's transl)].

In 3 districts of the county of Halle and in the cities of Halle and Halle-Neustadt about 18,000 children of different groups of age were examined wether they were suffering from recurrent or chronic nonspecific lung diseases (CNSLD). Among the 18,000 children we found 4.3% with lung diseases. The morbidity rate was the lowest in the city of Halle and in the district of Quedlinburg, while in Bitterfeld, the district with the highest air pollution, about two times more children had fallen ill. In all districts the prevalence of CNSLD in young children was much higher than in elder ones. In the district with the highest air pollution with increasing age of the children the rate of prevalence lowered more slowly than in the other districts.