平洲二中是广东省南海市的一所初级中学，地处珠江三角腹地，经济发达，物质生活水平高于全国平均水平，学生的营养状况逐年改善。为了掌握学生的身体形态发育情况，更好地对学生进行营养指导，笔者从1995年起连续3年对本校学生营养状况追踪观察，报道如下，l对象与方法1．1对? Pingzhou 2 is a junior middle school in Nanhai, Guangdong Province. It is located in the hinterland of the Pearl River Delta. Its economy is prosperous and its material living standards are higher than the national average. The nutritional status of the students is improving year by year. In order to master the physical development of students, and better nutrition guidance for students, the author from 1995 onwards for three consecutive years of follow-up observation of the nutritional status of students, reported as follows, l objects and methods 1.1 pairs?