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1 材料和方法1.1 材料 1997-04/1998-12对我院住院及门诊确诊为肝炎、肝硬变患者120例,均经肝功、生化、免疫学检查,符合肝炎、肝硬变的诊断标准,按有无吸烟史随机分为吸烟组和非吸烟组,再按时间顺序按下列标准进行配对:①职业相同;②性别相同;③年龄相差不超过5岁;④生活习惯相似;⑤吸烟程度相同.吸烟者系指每天吸烟量在20支以上,或每天吸烟量在10～20支之间持续20 a 者.吸烟指数相同是指吸烟指数相差不超过20,吸烟指数=每天吸烟支数×吸烟年数.符合上述标准者120
1 Materials and Methods 1.1 Materials 1997-04 / 1998-12 hospitalized in our hospital and outpatient diagnosis of hepatitis, cirrhosis in 120 patients, all by liver function, biochemical, immunological examination, in line with hepatitis, cirrhosis diagnostic criteria , According to whether there is a history of smoking were randomly divided into smoking group and non-smoking group, and then chronologically ordered according to the following criteria: ① the same occupation; ② the same gender; ③ age difference of not more than 5 years old; ④ lifestyle similarities; ⑤ smoking degree The same smoker refers to more than 20 cigarettes a day or 10 to 20 cigarettes a day for 20 a.The same smoking index refers to the difference between smoking index does not exceed 20, smoking index = number of cigarettes per day × Number of years of smoking