[Chronic bronchitis and respiratory capacity of the lungs in miners from a specific coal mine].

In the group of 3317 miners of one coal mine, who were employed for over 8 years, the prevalence of chronic bronchitis (ch.b.) and lung ventilation disorders was analysed. The frequency of ch.b. in the subjects under study was almost twice as high as in the general male population in Poland and significantly more frequent in miners with pneumoconiosis than in those without pneumoconiosis. Simple pneumoconiosis and ch.b. contributed to decreased ventilatory capacity of the lung.