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对两个煤矿的煤矿尘肺合并慢性支气管炎进行调查，频率为２６．１％和５５．３％，无尘肺０￣＋组合并率为１７．６％和２６．９％。煤矿尘肺合并慢性支气管炎是普通人群患慢性支气管炎的２．０和４．２６倍。尸检煤矿尘肺合并慢支气管炎的频率高，Ｐ＜０．０５．煤种、粉尘游离ＳｉＯ＿２含量、煤灰分的化学成分不同，可导致合并频率不同。频率高低还与尘肺期别、吸烟、结核、年龄呈现正相关。
Pneumoconiosis with chronic bronchitis in coal mines at two coal mines was investigated at frequencies of 26.1% and 55.3% with 0% + pneumoconiosis combined at rates of 17.6% and 26.9%. Coal mine pneumoconiosis with chronic bronchitis is 2.0 and 4.26 times that of the general population suffering from chronic bronchitis. The frequency of autopsy coal pneumoconiosis with chronic bronchitis was high, P <0.05. Coal, dust free SiO_2 content, different chemical composition of coal ash, can lead to different merger frequency. The frequency of pneumoconiosis also with smoking, tuberculosis, age showed a positive correlation.