| 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 including SI ,weight, body mass index (BMI), fat free mass and fat mass. Pearson correlation analysis method and multiple stepwise regression method were used to discuss the influencing factors of SI.Results Overall, the indexes of SI, height, weight, BMI, fat free mass and fat mass are rising along with the increasing age. However, there were differences in the growth rate of these indicators among different genders and ages, generally peaking in the group of 17 or 18, around 14 years old is the peak of bone development speed. SI had gender differences only in total and 13 years old group, and females were larger than males. SI was positively correlated with gender, age, height, weight, BMI, fat free mass and fat mass. However, gender, age ,BMI were the main influencing factors of SI.Conclusion The SI of han nationality adolescents in lanzhou have difference among different genders and ages, the main influencing factors are gender, age and BMI. |