| Objective To learn the bone health status in adolescents, and to explore the relationship between the bone mineral density (BMD) of the lumbar vertebrae (L2-4) and gender, serum 25-(OH)D3, body mass index (BMI), diet habit, physical exercise, and sexual developmental. Methods BMD of L2-4 was detected using dual energy X-ray absorptiometry (DEXA), and Z value was obtained. The serum concentration of 25-(OH)D3 was determined using semi-automatic enzyme immunoassay. The data of diet habit, physical exercise, and sexual developmental were acquired using survey method. Then all the subjects were divided into different groups. The difference between groups was statistical analyzed. Results Among all the subjects, 6% had a Z value ≤ -2.0. No significant difference of BMD and Z value between men and women was observed (P>0.05). The serum 25-(OH)D3 concentration and BMI in the group with Z value ≤ -2.0 were lower than those in other groups (P<0.01). The Z value in vegetarian anorexia group was lower than that in other groups (P<0.01). The Z value in effective exercise amount and different sexual development groups showed significant difference (P<0.01). Conclusion The detection of L2-4 BMD using DEXA is suitable for the evaluation of bone health in adolescents. The Z value of BMD is correlated with the serum 25-(OH)D3 concentration, BMI, diet habit, physical exercise, and sexual development. |