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为探讨改炉改灶干预措施对降低宣威地区肺癌发病率的效果，１９９２年进行了一次回顾性队列研究。改灶措施Ⅰ及措施Ⅱ均与肺癌发病率下降有较强的联系，其降低的程度大致与改灶时的年龄成反比。一生烧烟煤，在≤３０岁、３１～５０岁以及≥５１岁开始改灶与一生中未改灶的人群比较，男性患肺癌的相对危险度ＲＲ值分别为０．４２、０．６６及０．７５，女性分别为０．４２、０．６６及０．６６（以未改灶组为参照组，即其ＲＲ值为１．０）。男、女性在改灶后患肺癌危险性下降的程度相似。这些结果不仅支持了烧烟煤造成的室内空气污染与宣威地区肺癌之间具有因果关系的论点，同时也表明在我国农村地区实行改灶措施对降低肺癌发病率有重要意义
In order to explore the effects of changing stove interventions on reducing the incidence of lung cancer in Xuanwei, a retrospective cohort study was conducted in 1992. Change measures I and measures II have a strong correlation with the decline in the incidence of lung cancer, and the degree of reduction is roughly inversely proportional to the age at the time of change. Life-burning bituminous coal, the relative risk of lung cancer in men aged ≤ 30 years, 31 to 50 years, and ≥ 51 years, compared with those who did not change their focus in life, was 0.42, 0.66 and 0 respectively. .75, females were 0.42, 0.66, and 0.66, respectively (the uncorrected group was the reference group, ie, the RR was 1.0). Men and women suffer from a similar decrease in the risk of lung cancer after changing the focus. These results not only support the argument that the indoor air pollution caused by burning bituminous coal has a causal relationship with lung cancer in Xuanwei, but also indicate that the implementation of change measures in rural areas in China is of great significance in reducing the incidence of lung cancer.