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目的了解市区与郊区12～14岁男女骨密度(BMD)的变化规律。方法利用双能X线骨密度仪对613例健康中学生男女行全身扫描。其中,市区307例,郊区306例;男生296例,女生317例。结果市区男女生的全身总BMD值明显高于郊区男女生(P<0.01),市区男女生的身高比郊区男女生高2～5cm,市区男女生的体重比郊区男女生重2～10kg。女生BMD值高于同龄男生,女生BMD年增长速度快于同龄男生,女生BMD年增长2.7%～8.1%,男生BMD年增长2.1%～2.5%。结论该年龄段女生BMD值高于同龄男生,郊区男女生生长发育比市区同龄男女生晚约1～2年。
Objective To investigate the changes of bone mineral density (BMD) between urban and suburban men and women aged 12-14 years. Methods A total of 613 healthy middle and high school students were scanned by dual energy X-ray absorptiometry. Among them, there are 307 urban areas and 306 suburban areas; 296 boys and 317 girls. Results The total BMD of male and female students in urban areas was significantly higher than that of male and female students in suburban areas (P <0.01). The male and female students in urban areas were 2 ~ 5 cm higher than male and female students in suburban areas, 10kg. The BMD of girls is higher than boys of the same age, and the growth rate of girls’ BMD is faster than boys of same age. The growth rate of girls’ BMD is 2.7% ~ 8.1% and the growth rate of boys’ BMD is 2.1% ~ 2.5%. Conclusions The BMD of female students in this age group is higher than that of male students of the same age. The growth of male and female students in suburban age is about 1 to 2 years later than that of boys and girls of the same age in urban area.