Abstract：Objective To investigate the prevalence of postmenopausal osteoporosis (PMOP) and analyze its influencing factors among women at ages of 50 to 59 years in Dali Bai Autonomous Prefecture, Yunnan Province, so as to provide insights into the prevention of PMOP among menopausal women. Methods Bai Ethnic menopausal women at ages of 50 to 59 years who received healthy examination at the Center of Healthy Examination, Dali Prefecture People's Hospital from June 2017 to May 2021 were selected as the study subjects, and subjects' demographic characteristics, living habits, history of diseases, family history of osteoporosis and history of parturition were collected using self-designed questionnaires. The height, body weight and bone density were measured, and fasting blood glucose, vitamin D3, blood lipids and liver functions were detected. The factors affecting the development of PMOP were identified using a multivariable logistic regression model. Results Totally 2 000 questionnaires were allocated, and 1 584 valid questionnaires were recovered, with an effective recovery rate of 79.20%. The respondents had a mean age of ( 56.22±2.61 ) years, and mean body mass index ( BMI ) of ( 24.62±2.35 ) kg/m2. There were 497 respondents ( 31.38% ) with a family history of osteoporosis, and the prevalence of PMOP was 20.64%. Multivariable logistic regression analysis identified age ( OR=1.135, 95%CI: 1.074-1.196 ), age of menarche ( OR=1.138, 95%CI: 1.059-1.217 ), duration of menopause (OR=1.425, 95%CI: 1.228-1.622), number of parturition ( >2, OR=5.036, 95%CI: 2.972-7.101 ), smoking ( OR=2.594, 95%CI: 1.767- 3.421 ), alcohol consumption ( OR=2.051, 95%CI: 1.503-2.598 ), family history of osteoporosis ( OR=2.540, 95%CI: 1.769-3.311 ), hypertension ( OR=1.492, 95%CI: 1.406-1.578 ), diabetes ( OR=1.774, 95%CI: 1.581-1.967 ), total cholesterol ( OR=1.483, 95%CI: 1.251-1.716 ), triacylglycerol ( OR=1.801, 95%CI: 1.576-2.026 ), low-density lipoprotein cholesterol ( OR=1.614, 95%CI: 1.498-1.731 ), fasting blood glucose ( OR=1.192, 95%CI: 1.077-1.307 ), BMI ( OR=0.934, 95%CI: 0.862-0.993 ), outdoor activity ( ≥1 time/week, OR: 0.413-0.549, 95%CI: 0.329-0.637 ), age of menopause ( OR=0.909, 95%CI: 0.841-0.977 ), daily intake of calcium ( ≥600 mg, OR: 0.493-0.644, 95%CI: 0.389-0.786 ), vitamin D3 level ( ≥20 ng/mL, OR: 0.604-0.719, 95%CI: 0.523-0.853 ) and high-density lipoprotein cholesterol ( OR=0.658, 95%CI: 0.550-0.767 ) as factors affecting the development of PMOP. Conclusions The prevalence of PMOP in Dali Bai Autonomous Prefecture is similar to the nationwide level in China, and old age, smoking, alcohol consumption, a family history of osteoporosis and high blood lipid levels may increase the risk of PMOP.
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