Raffat Sheikh Kashif, Shaikh Abdul Basit, Sarim Muhammad, Syed Akhter Raza
Department of Computer Science, Federal Urdu University of Arts, Sciences and Technology, Karachi, Pakistan.
J Pak Med Assoc. 2015 Apr;65(4):388-91.
To analyse the behaviour of bone mineral density (BMD) of total body, lumbar and thoracic spine, and compare it between different age-groups, ethnicity and gender as a secondary analysis of already published data of NHANES.
The study was done and compared data of the National Health and Nutrition Examination Survey which was done from 1999 to 2006. It comprised bone mineral density data of 26,215 subjects of age 8 years and over. The sample was divided into 10 age groups, 3 ethnicities and gender groups. All subjects had bodyweights not exceeding 300lb, and height not greater than 6'5''. Female subjects were non-pregnant. SPSS 16 was used for statistical analysis.
Of the total subjects, 7712 (29.41%) were Mexican Americans, 11236 (42.86%) were non-Hispanic whites and 7267 (27.73%) were non-Hispanic blacks. There were 13291 (50.69%) males, and each ethnic group also had approximately 50% males. The bone mineral density of non-Hispanic blacks was higher than the other two groups, whereas males of all ethnic groups and races had higher density then females of the same group. Bone mineral density of total body, lumbar and thoracic was significantly different. After 50 years of age, total body, lumbar and thoracic bone mineral density decreased in females but lumbar slightly increased in males, whereas thoracic remained stable and total body decreased.
The bone mineral density of male and blacks was higher than female and non-black races in total body, lumbar and thoracic spine. The thoracic BMD was lower and might predict early fracture risk.
作为对已发表的美国国家健康与营养检查调查（NHANES）数据的二次分析，分析全身、腰椎和胸椎的骨矿物质密度（BMD）行为，并比较不同年龄组、种族和性别的BMD情况。
本研究采用并比较了1999年至2006年进行的美国国家健康与营养检查调查的数据。该研究包含了26215名8岁及以上受试者的骨矿物质密度数据。样本被分为10个年龄组、3个种族组和性别组。所有受试者体重不超过300磅，身高不超过6英尺5英寸。女性受试者未怀孕。使用SPSS 16进行统计分析。
在所有受试者中，7712人（29.41%）为墨西哥裔美国人，11236人（42.86%）为非西班牙裔白人，7267人（27.73%）为非西班牙裔黑人。男性有13291人（50.69%），每个种族组中男性也约占50%。非西班牙裔黑人的骨矿物质密度高于其他两组，而所有种族和民族的男性骨密度均高于同组女性。全身、腰椎和胸椎的骨矿物质密度存在显著差异。50岁以后，女性的全身、腰椎和胸椎骨矿物质密度下降，但男性腰椎骨密度略有增加，胸椎保持稳定，全身骨密度下降。
在全身、腰椎和胸椎方面，男性和黑人的骨矿物质密度高于女性和非黑人种族。胸椎骨密度较低，可能预示早期骨折风险。
