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为了给学校卫生工作提供依据，我们于1995年3月对两所点校二年级和五年级的393名学生进行了测试，并对有关因素进行了调查。1对象和方法1．1对象：某市两所小学二年级和五年级学生，共393人。1．2方法1．2．1年龄计算：实足年龄等于测试日期减去出生日期（阴历则加一个月）。1
In order to provide a basis for school health work, we tested 393 students in grades two and five of two schools in March 1995 and investigated the factors. 1 objects and methods 1.1 target: a city two primary and fifth grade students, a total of 393 people. 1.2 Methods 1.2.1 Calculation of Age: A full-year age equals the date of the test minus the date of birth (plus one month for the lunar calendar). 1