KO-HSIU LU2026-10-162026-10-162014-07-28Pure ID: 15280350Pure UUID: 785cd16f-a5fe-4223-ad12-82ff369d195f10.1186/1471-2474-15-257https://www.scopus.com/pages/publications/84904782147https://scholars.csmu.edu.tw/handle/123456789/29569Background: Vitamin D is essential for calcium metabolism, Vitamin D deficiency can precipitate osteoporosis, cause muscle weakness and increase the risk of fracture. The aim of this study was to assess the prevalence of vitamin D inadequacy among non-supplemented postmenopausal women with osteoporosis and fragility fractures of the hip or vertebrae in Taiwan. Methods. This multi-center, cross-sectional, observational study analyzed the vitamin D inadequacy [defined as 25(OH) D level less than 30 ng/mL] in Taiwanese postmenopausal osteoporotic patients who suffered from a low trauma, non-pathological fragility hip or vertebral fracture that received post-fracture medical care when admitted to hospital or at an outpatient clinic. Results: A total of 199 patients were enrolled at 8 medical centers in Taiwan; 194 patients met the study criteria with 113 (58.2%) and 81 (41.8%) patients diagnosed with hip and vertebral fracture, respectively. The mean serum 25(OH) D level was 21.1 ± 9.3 ng/mL, resulting in a prevalence of vitamin D inadequacy of 86.6% of the patients. Conclusions: High prevalence of vitamin D inadequacy across all age groups was found among non-supplemented women with osteoporosis and fragility hip or vertebral fracture in Taiwan.enjournal article