中文摘要：

目的通过比较体质量指数（BMI）、生物电阻抗分析（BIA）和腰围（WC）在评估儿童生长发育上的一致性，探讨BIA和WC评估儿童体格生长的准确性。方法研究对象为2011年8月至2012年8月南京儿童医院儿童保健科门诊健康体检的儿童。运用生物电阻抗仪测量儿童体质量、身高、体脂含量、骨骼肌含量、骨矿物质含量等，用软尺测量WC，按BMI和体脂百分比的参考值，将研究对象分为肥胖、超重、正常和消瘦；按照WC分为正常与异常。结果本研究共收集儿童2313例，其中男童1528例，年龄7．7岁（3．0～16．8岁）；女童785例，年龄7．2岁（3．0—17．5岁）。男女童骨矿物质含量随年龄增加而增加（P〈0．001）。用BMI评价，超重、肥胖484例（20．9％），消瘦266例（11．5％）；按BIA评价，超重、肥胖663例（28．7％），消瘦481例（20．8％）；按WC评价，异常597例（25．8％）。在评价超重和肥胖时，WC和BIA的敏感性和特异度均较高，使用WC联合BIA分析超重肥胖时，女童的特异性较高，而男童敏感性较高；在评价消瘦时，BMI的敏感性高于BIA。结论BIA作为人群普查的常用指标是可靠的，若同时测量WC更为理想，BIA的高灵敏性更适用于儿童超重与肥胖的筛查。

英文摘要：

Objective To compare body mass index（BMI） , bioelectrical impedance analysis（BIA） and waist circumference（WC） for the assessment of the growth and development of the children, and to explore the accuracy of BIA and WC for the assessment of the growth and development of the children. Methods Children were surveyed in Department of Child Health Care of Nanjing Children＇s Hospital from Aug. 2011 to Aug. 2012. BIA was used to measure body fat, skeletal muscles and bone minerals of these children, and WC was measured by meterstick. According to BMI and body fat parameters, the study subjects were classified into lower weight, normal weight, overweight and obese groups. According to the WC,the subjects were divided into the normal group and the abnormal group. Results There were 2313 children in this survey, 1528 boys of them, median age 7.7 years old（ ranged from 3.0 to 16.8 years old）, and 785 girls of all the children, median age 7.2 years old（ ranged from 3.0 to 17.5 years old）. Bone mineral content of skeletal muscles increased with age in boys and girls（P 〈0. 001 ）. According to BMI,there were 484（20.9% ） obese children and 266 （ 11.5% ） lower weight children ; according to the BIA, there were 663 （ 28.7% ） obese children and 481 （20.8 % ） lower weight children;according to the WC, there were 597 （25.8 % ）abnormal children. The sensitivity and specificity of WC and BIA were both higher in the evaluation of overweight and obesity status. When overweight and obesity were analyzed by BIA as well as WC, girls showed a higher specificity, while the boys showed a higher sensitivi- ty. The sensitivity of BMI was higher than BIA in evaluating weight loss. Conclusions BIA as a commonly used indi-cator is reliable for population census, and it is more desirable if the measurement of WC is done at the same time. The high sensitivity of BIA makes it more suitable for screening overweight and obesity of children.