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对６ ３８１ 名农民轮换工进行横断面流行病学调查分析， 结果表明： ０ ＋ 和Ⅰ期尘肺检出率分别为５－３ ％ 和０－４ ％ ， 主掘和纯采工种的检出率较高， 平均发病工龄为５ 年。
The cross-sectional epidemiological survey of 6 381 peasant workers showed that the detection rates of 0 + and Ⅰ pneumoconiosis were 5-3% and 0-4%, respectively Higher, the average length of service is 5 years.