PREVALENCE AND RISK FACTORS OF VITAMIN D INADEQUACY AMONG THAI ELDERLY PATIENTS WITH OSTEOPOROTIC HIP FRACTURE
Background: Vitamin D deficiency directly impacts bone biology, eventually resulting in elevated risk of fragility fracture. Despite its global abundance, data concerning its prevalence and risk factors among Thai patients with osteoporotic hip fractures remains lacking.
Objectives: This study aimed to evaluate the average level of serum vitamin D, prevalence of hypovitaminosis D and its risk factor among Thai elderly patients with fragility hip fractures.
Methods: A cross-sectional study was conducted among Thai patients with fragility hip fractures aged 60 years or older in a single center from April 2016-April 2020. The patients were divided according to serum 25-hydroxy vitamin D (25-(OH)D) levels. Demographic data were compared to identify risk factors of vitamin D inadequacy.
Results: Of 258 patients, 74.81% were females with mean age of 78.76 years. The average serum 25(OH)D level was 19.64 ng/mL. Prevalences of vitamin D inadequacy, vitamin D insufficiency and vitamin D deficiency were 86.05, 28.69 and 57.36%, respectively. When compared with the vitamin D sufficiency group, the vitamin D inadequacy group had a history of frequent falls, higher body mass index (BMI) as well as high parathyroid hormone (PTH) levels.
Risk factors associated with vitamin D inadequacy were BMI >23 kg/m2 (AOR= 4.67, 95%CI=1.24-17.73), and two or more falls within a year (AOR= 3.96, 95%CI=1.38-11.33). Moreover, risk factors associated with vitamin D deficiency were being female (AOR= 2.87, 95%CI=1.06-7.78), BMI >23 kg/m (AOR=7.20, 95%CI =1.67-31.02), two or more falls within one year (AOR=7.32, 95%CI =2.17-24.69) and elevated PTH level (AOR= 3.38, 95%CI=1.17-0.74).
Conclusion: Most elderly patients with fragility hip fractures had hypovitaminosis D. Risk factors included high BMI, frequent falls for vitamin D inadequacy, being female and high PTH levels for vitamin D deficiency. Serum 25(OH)D assessment and appropriate supplement are recommended, especially for patients with fragility hip fractures and aforementioned risk factors.
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