Abstract: Objective To investigate the incidence of bone mineral density reduction in elderly people （age>65 years old） in the health examination center of Huantai County People’s Hospital, and to explore the related influencing factors. Methods A retrospective analysis was performed on the elderly population who had undergone physical examination at the Physical Examination Center of Huantai County People’s Hospital from January, 2020 to July, 2021. Among them, 657 people who had undergone bone mineral density measurement were selected and divided into two groups according to whether bone mineral density decreased. In the two groups （292 people in the normal BMD group and 365 people in the reduced BMD group）, general information was investigated using self-designed questionnaires. Logistic regression was used to analyze the influence of smoking, body mass index, blood pressure, outdoor sports and other factors on bone mineral density. Results There was no statistical significant difference in age, gender, LDL and diabetes prevalence between the two groups(P>0.05). The body mass index （BMI） of the reduced BMD group was significantly lower than that of the normal BMD group, and the normal BMD group was higher The prevalence of blood pressure was lower than that in the decreased bone mineral density group （P<0.05）. Logistic regression showed that BMI, prevalence of hypertension, smoking, and frequent participation in outdoor sports were the influencing factors of bone mineral density reduction, with OR values of -0.819, 3.772, 1.874, and -1.592, respectively. Conclusion The incidence of bone mineral density reduction in the elderly physical examination population in Huantai area health examination center is about 44.44%. Hypertension and smoking are risk factors for the trend of bone mineral density reduction. BMI and frequent participation in outdoor sports are independent protective factors of bone mineral density.

Key words: Elderly, population taken part in health check-up, bone mineral density, influencing factor