The impairment of lung function among the patients with single CWP showed obstructive type, while patients with complex DWP exhibited mixed type of damaged lung function.
单纯煤工尘肺组肺功能损害以阻塞型为主，复合煤工尘肺肺功能损害以混合型为主。
Conclusion: the risk of lung cancer increases in the patients with a history of COPD, and the impairment of lung function is suggested to increase the risk of lung cancer.
结论：有COPD病史的患者，肺癌发生的危险性明显增高。肺功能的损伤增加了肺癌发生的危险性。
Multistepwise regression analysis indicated that initial years of dust exposure and chronic bronchitis have significant effects on lung function impairment in miners with past dust exposure.
多因素分析结果表明：接尘起始年代、慢性支气管炎对脱尘工人肺通气功能损害的影响尤为明显。
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