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我镇在1999年对辖区内的中小学校学生进行恒牙发病情况调查。现将调查资料分析如下。 1 对象与方法 1.1 对象:小学生组7～12岁,1346人;中学生组13～15岁,360人。 1.2 方法:由牙科医生直接检查。 2 调查结果 各年龄组恒牙龋病情况见表1和表2。
My town in 1999 in the area of primary and secondary school students to investigate the incidence of permanent teeth. The survey data are analyzed as follows. 1 objects and methods 1.1 object: primary school students group 7 to 12 years old, 1346 people; middle school students group 13 to 15 years old, 360 people. 1.2 Methods: Direct inspection by a dentist. 2 Results The age of the group of permanent dental caries in Table 1 and Table 2.