Objective To investigate the prevalence of low body w eight or thinness in Beijing pubertal girls and the cut-off body mass index(BMI )for Chinese pubertal girls. Methods Data used for the analyses were drawn from a random sampl e of 1214 adolescent girls aged 12-13 years from rural and urban areas of Beijin g,China,in a nutritional survey in 1995.Variables included age,height,weight,BMI ,bone age,menarche,breast and pubic hair development,bone mineral content(BMC),b one mineral density(BMD)and bone width(BW)at distal 1/3 and 1/10 radius and ulna .BMI assessment criteria established by Chinese Ministry of Health and State Edu cation Commission and WHO recommendation on BMI-for-age were used. Results The low body weight(BMI＜18) rate was 32.2%.Compared wi th those with normal weight, the girls with low body weight had lower bone age, delayed breast and pubic hair development, lower menarche rate,and lower BMC,BMD and BW at distal 1/3 radius and ulna (P＜0.05).Logistic regression analys is showed that BW,bone age,breast development and BMI were determinants/predicto rs of BMC of the forearm.When BMI＜18,the risk of BMC at 1/3 ulna less than the median was 1.75 times of that when BMI=18-21. Conclusion High pre vale nce of low body weight was a major nutritional health problem among Beijing pube rt al girls.BMI<18 is recommended as the cut-off value for delayed growth and deve lopment as well as at risk of low BMD.Menarche is a useful indicator of nutritio nal status.Nutritional interventions need to be introduced to girls with low body weight to improve their growth and bone health.%目的 调查青春期女孩低体重率并探讨适合我国青春期女孩体重指数(BMI)的评 价标准。方法 对1214名北京城乡12～13岁女学生1995年营养状况调查的 样本资料进行分析，指标包括年龄、身高、体重、BMI、骨龄、月经初潮、第二性征发育、 左前臂远端1/3和1/10位点桡尺骨骨矿含量、骨密度、骨宽度。BMI评价采用改良的我国卫生 部和国家教委标准及世界卫生组织推荐标准。结果 低体重率(BMI＜18)为32.2%，低体重组比正常体重组生长发育指标 明显滞后，尺骨远端1/3位点骨矿含量(BMC)低于平均水平的危险性增加(Odds值1.75，95% 可信区间为 1.04～2.95)75%。结论 高的低体重率是北京青春期女孩的主要营养健 康问 题，BMI＜18可作为生长发育滞后和具有低骨密度危险的分界点，月经初潮可作为营养状况 的监测指标。对低体重女孩应采取营养等干预措施，以促进其生长发育和骨骼健康。
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