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1 对象和方法11 对象 选择全区地级医院及9县(市)的县级乡镇级医院的403例医用诊断Ｘ线工作者作为放射组(男女比例为607∶1,平均年龄为3447岁,平均工龄为1078年,Ｘ线照射人均年剂量为2265ＳＶａ-1)并从同级医院选择性别、年龄、生活状况与放射组基本相似的403例临床医务工作
1 Subjects and Methods 11 Subjects: 403 medical diagnostic X-ray workers of prefecture-level hospitals and county-level township hospitals of 9 counties (cities) were selected as radiation group (the ratio of male to female was 607:1, the average age was 3447, The average length of service was 1078 years, and the average annual dose of X-ray irradiation was 2265SVa-1). 403 cases of clinical medical work with similar sex, age, and living conditions from the same level hospital were selected