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钙是人体必需的宏量元素，对于维护机体正常功能、生长发育起着非常重要的作用。儿童体内缺钙易患软骨病。学龄前儿童处在生长发育迅速的时期，这时缺钙对儿童身体发育和智力都有极大影响。目前学龄前儿童发钙含量尚无统一标准。我们测定了南充市学龄前儿童相同年龄472例发中钙
Calcium is an essential macroscopic element of the human body and plays a very important role in maintaining the normal function and growth of the body. Calcium deficiency in children prone to rickets. Preschool children are in a period of rapid growth and development, when calcium deficiency has a great impact on children’s physical development and intelligence. At present, there is no uniform standard for calcium content in preschool children. We measured the same age 472 cases of calcium in preschool children in Nanchong City