OBJECTIVE: To study the upper limit of normal thyroid volume based children 8-10 years old in Zhejiang Province. At the same time, the revision methods of thyroid volume were discussed. METHODS: The thyroid volume of 1110 children 8-10 years old in Zhejiang province, was measured by ultrasonography during the fifth national survey of IDD in 2002 and was analyzed by using SPSS 10.0 for Windows. RESULTS: 1. Children's thyroid volume was progressively increased with age. But there was no significant difference between boys and girls. 2. The upper limit of normal thyroid volume of children at the age of 8, 9 and 10 years old in a province were 4.7, 5.3 and 6.0ml respectively. The upper limit of normal thyroid volume in children at the age of 8 and 9 is higher than the corresponding criteria of GB16398-1996. 3. Of all the four revision methods of thyroid volume, HVI was better than others. CONCLUSIONS: 1. The upper limit of normal thyroid volume of children at the age of 8-10 years old in a province was reasonable, and these normative values were useful for the IDD surveillance in a province and were also referential for revision of Chinese national normative values for schoolchildren. 2. HVI maybe the best method to adjust the thyroid volume at present.
OBJECTIVE: To study the upper limit of normal thyroid volume based children 8-10 years old in Zhejiang Province. At the same time, the revision methods of thyroid volume were discussed. METHODS: The thyroid volume of 1110 children 8-10 years old in Zhejiang province, was measured by ultrasonography during the fifth national survey of IDD in 2002 and was analyzed by using SPSS 10.0 for Windows. RESULTS: 1. Children's thyroid volume was progressively increased with age. But there was no significant difference between boys and girls. 2. The upper limit of normal thyroid volume of children at the age of 8, 9 and 10 years old in a province were 4.7, 5.3 and 6.0ml respectively. The upper limit of normal thyroid volume in children at the age of 8 and 9 is higher than the corresponding criteria of GB16398-1996. 3. Of all the four revision methods of thyroid volume, HVI was better than others. CONCLUSIONS: 1. The upper limit of normal thyroid volume of children at the age of 8-10 years old in a province was reasonable, and these normative values were useful for the IDD surveillance in a province and were also referential for revision of Chinese national normative values for schoolchildren. 2. HVI maybe the best method to adjust the thyroid volume at present.