| 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. |