兰州汉族青少年骨强度指数特点及其影响因素分析

目的调查分析兰州汉族青少年跟骨骨强度指数(bone strength index,SI)变化规律,探讨其影响因素。方法采用超声骨密度仪和生物电阻抗分析仪测量662例(男345例,女317例)兰州汉族青少年SI及体重、体质量指数(body mass index,BMI)、去脂体重、脂肪量4项体成分指标,采用Pearson相关分析法和多元逐步回归法探讨SI的影响因素。结果总体来看,随年龄增加,兰州汉族青少年SI以及身高、体重、BMI、去脂体重、脂肪量5项指标均呈上升趋势。但是,不同性别以及不同年龄段各指标的增长速度存在差异,一般在17岁组或18岁组达到峰值,其中14岁左右为骨发育速度高峰。SI仅在总体上和13岁组存在性别差异且女性大于男性。SI与性别、年龄、身高、体重、BMI、去脂体重、脂肪量均呈正相关关系。而性别、年龄和BMI是SI的主要影响因素。结论兰州汉族青少年SI在不同性别和不同年龄段间变化规律不同,主要的影响因素为性别、年龄及BMI。

The characteristics and influencing factors of bone strength index of Han nationality adolescents in Lanzhou

Objective Investigating and analyzing the changes of bone strength index (SI) of Han nationality adolescents in Lanzhou and exploring its influencing factors. Methods 662 (345 males and 317 females) of Han nationality adolescents in Lanzhou were measured by ultrasonic bone density instrument and bioelectrical impedance instrument. The test indexes included SI, weight, body mass index (BMI), fat free mass and fat mass. Pearson correlation analysis and multiple stepwise regression were used to discuss the influencing factors of SI. Results Overall, the indexes of SI, height, weight, BMI, fat free mass and fat mass increased with the increase of age. However, there were differences in the growth rate of these indicators among different genders and ages; in general the peak was reached in the group of 17 or 18 years of age, and around 14 years old was the peak of bone development velocity. SI had gender differences only in the total sample and 13 years old group, and females had greater values than males. SI was positively correlated with gender, age, height, weight, BMI, fat free mass and fat mass. However, gender, age and BMI were the main influencing factors of SI. Conclusion The SI of Han nationality adolescents in Lanzhou was different among different genders and ages, and the main influencing factors were gender, age and BMI.