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为了探讨肠道线虫感染查治对小学生营养状况的影响，我们于1991年9月至11月对查治3年后的小学生进行了现时营养状况调查。1对象与方法1．是查治组和对照组各选7所小学，包括一至六年级，7～12岁男、女学生。废除无效卡片后，查治组共17i3人，其中男生864人，女生849人；对照组?
In order to explore the impact of gut-nematode infection control on nutritional status of primary school students, we investigated the current nutritional status of primary school students aged 3 to 9 years from September to November 1991. 1 objects and methods 1. The investigation group and control group selected seven primary schools, including the first grade to the sixth grade, 7 to 12-year-old male and female students. Abolition of invalid card, the investigation group a total of 17i3 people, including 864 boys and 849 girls; control group?