不同钙摄入量的两地南方儿童骨矿物质含量

BONE MINERAL CONTENT OF TWO POPULATIONS OF CHINESE CHILDREN WITH DIFFERENT CALCIUM INTAKE

用单光子吸收仪测量５岁儿童（１１５名江门市儿童和１２８名香港儿童）桡骨远端１／３处骨矿物质含量（ＭＢＣ）。江门市和香港儿童钙平均摄入量分别为２４４±４６及５４２±３３２ｍｇ／ｄ。江门市儿童骨矿物质含量、体重和身高均明显低于香港儿童的相应数值，分别低１４％、１０％和４％（Ｐ＜０．００１）。经多元回归分析调整后，骨矿物质含量的地区差异仍是０．０３０３ｇ／ｃｍ。比较两地低钙摄入量的５岁儿童骨矿物质含量，江门市儿童骨矿物质含量同样明显低于香港儿童（Ｐ＜０．００３）。本研究结果提示。

one mineral content(BMC)of 5-year-old Chinese children (l15 chil-dren in Jiangmen,and l28 children in Hong Kong) was evaluated by sin-gle-photon absorptiometry at the distal l/3 radius.The M±SD calcium intakes of Jiangmen and Hong Kong were 224±46 and 542 ±332 mg/d,respectively. The mean BMC, weight and height of Jiangmen children were significantly less than Hong Kong children by 14%,10%,and 4%, respectively(P<0.00l).A regional difference in BMC of 0.0303g/cm(P<0.000])still remained after adjusting for bone width and weight by mul-tiple regression analysis. Comparing sub-groups of children in the two re-gions with comparable low current calcium intake at 5 years, the BMC of Jiangmen children was still significantly lower thaii that of Hong Kong children (P<0.003),The study suggests that the regional discrepancy in BMC might be explained by long-term habitual calcium intake and physical activity.