Objective To observe children's minerals in Zhoushan islands and to provide guidance for children's health care.
Methods The minerals in blood including lead, cadmium, zinc, calcium, iron, magnesium and copper were detected in blood samples of children randomly selected from over ten thousand of those coming to our hospital for health care inspection from Jan. 2006 to Dec. 2010.
Results The levels of blood lead and blood calcium of 2009 and 2010 were higher than that of 2006 (P<0.05); there was no significant difference among the other minerals. The abnormal rates of blood lead, zinc, iron and calcium were significantly high. The abnormal rates of blood lead from 2006 to 2010 were 8.2%, 10.1%, 11.4%, 12.1% and 13.2% respectively which exhibited an increasing trend. The abnormal rates of blood calcium from 2006 to 2010 were 10.2%, 9.7%, 9.3%, 8.8% and 8.8% respectively showing a declining trend.
Conclusion Except very low deficiencies of magnesium and copper in the islands' children in the latest five years, the deficiencies of cadmium, zinc and iron are quite significant, and the abnormal rate of blood lead increases by years. However, calcium deficiency is improved. The surveillance on children's micronutrients provides evidence to improve adolescent health in Zhoushan area.
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