为评价致癌物质和职业因素对肺癌的致病作用开展了此次病例对照研究。病例组为德国不来梅市和法兰克福市各医院在１９８８～１９９３年间确诊的１００４例肺癌患者，其中男性８３９例，女性１６５例。按照１∶１配对，选择性别和居住地区相同，年龄相差不超过±５岁的当地居 The case-control study was conducted to assess the pathogenic effects of carcinogenic substances and occupational factors on lung cancer. The case group consisted of 1,004 lung cancer patients diagnosed between 1988 and 1993 in various hospitals in Bremen and Frankfurt, including 839 males and 165 females. According to the 1:1 pairing, choose the same gender as the residential area, and the age difference should not exceed ± 5 years old