Investigation of the value of Z score in the diagnosis of senile osteoporosis.

Objective By changing the age of tested subjects, to understand the T score and Z score along with the change of age, and to investigate this effect on quantitative measurement of bone mineral density (BMD). Methods A total of 155 patients, who received CT quantitative measurement of BMD from August 2012 to December 2012, were selected. According to different age groups, the analysis of the change in bone mass was performed. Twenty female patients were extracted from patients between 30 and 40 years old. By manually changing their ages, the changes of T and Z score were analyzed. Results According to the different definition of T and Z score, T score was closely related to BMD, showing no change along with age. Z score was the comparison with population at the same age. The change of Z score was obvious at the same BMD. Conclusion In CT quantitative measurement of BMD, age is one of the important factors to affect the evaluation results. The usage of Z score in the evaluation of BMD and the diagnosis of osteoporosis is more valuable. [ABSTRACT FROM AUTHOR]