Objective To find out the situation of bone nutrition and the change with age of the preschool children in Haidian, Beijing. Method Speed of sound (SOS) of calcaneus of 9 068 preschool children aged 2～6 years old were measured with quantitative ultrasound system. Results Calcaneus SOS decreased gradually as age increasing, and there was no significant difference between boys and girls.The deficiency rate of bone mineral content of boys was 49.83% and that of girls was 38.47%, and mild deficiency rate was 87.40%.There were statistic differences of the distribution of the deficiency degree in different age between boys and girls. Conclusions SOS of calcaneus of preschool children aged 2～6 years old in Haidian, Beijing decrease gradually as age increasing, and the deficiency of bone mineral content especially mild deficiency is prevalent.
Key words
preschool children /
calcaneus /
quantitative ultrasound /
bone mineral content
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