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为了探索中、小学生牙周疾病的发病情况,做好儿童少年的口腔卫生工作,我们于1982年12月～1983年1月对成都市2100名中、小学生牙周疾病的发病情况进行了调查。 1 调查对象与方法 1.1 调查对象:采取随机抽样调查本地生长的城乡中、小学校的学生,年龄为7、9、12、15、17岁五个年龄组,每个学校各年龄组均检查30人以上,男女生各半,按实足年龄计算。以调
In order to explore the incidence of periodontal disease among primary and secondary school students and to do a good job in oral hygiene for children and adolescents, we investigated the incidence of periodontal disease among 2,100 primary and secondary school students in Chengdu from December 1982 to January 1983. A survey of subjects and methods 1.1 Survey: Random sample survey of urban and rural primary and secondary school students in local growth, the age of 7,9,12,15,17 five-year age group, each school 30 age groups were examined Above, half male and female students, according to the actual age calculation. To tune