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目前国内关于中学生维生素C营养状况的报道较少。为获得这方面的基本资料以便有的放矢地进行膳食指导，我们于1995年3月对郑州市和修武县两地的中学生做了抽样调查。1．对象及方法1．1对象用随机整群抽样的方法确定郊大附中、修武县城关中学初中一年级学生各一班为此次调查对象
At present, there are few reports on the nutritional status of vitamin C in middle school students in China. In order to obtain basic information in this regard so as to provide targeted instruction, we conducted a sample survey of middle school students in Zhengzhou City and Xiuwu County in March 1995. 1. Subjects and methods 1.1 objects with a random cluster sampling method to determine the suburban middle school, Xiuwu County junior high school students a class for the survey