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为了解部队离退休老干部吸烟与胃肠癌患病率的关系，成都军区机关第一门诊部选择了在膳食习惯、生活条件和所处环境都基本相同的该地区的％个部队干休所的离退休老干部进行了流行病学调查，共2568人，均为男性，年龄为ed岁一u一岁，平均69．4岁。按统一调查表随访包括开始吸烟
In order to understand the relationship between the retired veteran cadres’ smoking and the prevalence of gastrointestinal cancer, the first outpatient department of the Chengdu Military Area Command chose a group of troops in the area that have basically the same dietary habits, living conditions and environment. The retired veteran cadres conducted an epidemiological investigation, involving a total of 2,568 men, all of whom were male and had an age of one year and one year old, with an average age of 69.4 years. Follow-up on a unified questionnaire including initiation of smoking