To study the impact of height, weight, body mass index ( BMI ) on bone mineral density ( BMD ) among children aged 5-14 years and the correlation among them. Methods From April 2010 to June 2011 altogether 1 219 healthy children aged from 5 to 14 years old, visiting the child health outpatient of Shenyang Children s Hospital for routine physical examination, were selected as the subjects of the study. Weight and height of them were measured and BMI was calculated. The BMD of the whole body was scaled with dual energy X-ray absorptiometry( DPX-NT ), and the captured data was analyzed. Results In each age group BMD increased with age, and it had positive correlation with age( r = 0. 694, P < 0. 01 ), height( r = 0. 757, P < 0. 01 ), weight( r = 0. 775, P < 0. 01 )and BMI( r = 0. 593, P <0. 01 ). There was difference in BMD between different sex in some of age groups (5-8 years ) and it had statistical significance ( both P <0. 05 ). Conclusion Children' s BMD is a continuous cumulative process, and is affected by height, weight, BMI and other factors. Therefore, influencing factors such as physical development should be considered in the process of evaluating BMD.%目的 研究5～14岁儿童身高、体重及身体质量指数对骨密度的影响及其相关性.方法 选择2010年4月至2011年6月就诊于沈阳市儿童医院儿保门诊的1 219名健康儿童为研究对象,进行身高和体重的测量,计算身体质量指数,采用DPX NT型双能X线骨密度仪测量全身骨密度,并对数据进行分析.结果 各年龄组的骨密度随年龄的增加而递增,其与年龄(r=0.694)、身高(r=0.757)、体重(r=0.775)、身体质量指数(r=0.593)呈正相关,均P<0.01;骨密度在部分年龄组(5～8岁)不同性别间存在差异,且有统计学意义(均P<0.05).结论 儿童时期的骨密度是一个连续累积的过程,其受身高、体重及身体质量指数等多因素的影响,因此在评价过程中,应该考虑体格发育等因素的影响.
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