【Objective】 To examine the status and the growth pattern of the ultrasonic bone mineral density and to set up normal database of the children under 15 years in China for child health care, pediatrics clinical and scientific research. 【Methods】 With the cluster sampling in Zhuhai, Kunming, Chenzhou, Suzhou, Anqing, Yangzhou, Chengdu and Shenyang city, 29 276 healthy children, among them 15 411 boys and 13 865 girls, aged from 1 month to 15 years old, divided into 12 age groups, were investigated, filled in the questionnaire, measured the weight and height conventional, assayed the bone mineral density at the middle tibia ahead side in the left curs with the ultrasonic bone analyzer of "Hongyang 1000-C model" made in China. 【Results】 The data indicated that 1)the Ultrasonic BMD value was the lowest in the groups from 1 month to just 6 months, then gradually increased with the age increase, and reached the maximum from 12 to 15 years; 2)the bone mineral density was not significant difference between boys and girls(t=0.824,P>0.05); 3)the BMD value was increased gradually with weight increase and gained quickly when weight in the 16 kg, then gained slowly when weight out the 16 kg; 4)the BMD value was increased gradually with height increase and gained slowly when height in the 75 cm, but the increase quickly when the height from 75 cm to 120 cm, then the increase slightly slower; 5)the predictor formula of the BMD chief component in the every aged groups were as follow, 1)the BMD value=2 954.69×(months-4.91)×(weight+1.52)×height for infant age; 2)the BMD value=2 901.90×(age-20.86)×(weight+5.41)×height for toddle's age; 3)3 136.91×(age-21)×(weight+4.39)×height for preschool age; 4)3 480.06×(age-1.05)×(weight+0.61)×height for school age and adolescence. 【Conclusions】 The ultrasonic BMD value and the correlation coefficient with the age, weight and height of normal children under 15 years in different age groups in the data can be referenced clinically.
Key words
ultrasound /
bone /
density /
children
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