Abstract
Introduction
The association between body size and fracture risk is complex and varies by sex and ethnicity. This study aimed to examine associations of body mass index (BMI) and height with osteoporotic fracture risk in middle-aged and older people.
Materials and Methods
This 10-year cohort study included 13,151 community-dwelling Japanese people aged 40–74 years. A self-administered questionnaire survey was conducted at baseline to obtain information on demographic characteristics, body size, lifestyle, and disease history. BMI (kg/m2) was categorized as underweight (< 18.5), low-normal (18.5–21.7), high-normal (21.8–24.9), overweight (25.0–29.9), and obese (≥ 30.0). Height was categorized into quartiles. All incident cases of major osteoporotic fractures, including fractures of the distal radius, neck of the humerus, neck or trochanter of the femur, and vertebrae, were obtained from medical records during follow-up.
Results
Mean participant age was 58.8 years. In men, the underweight group had a significantly higher hazard ratio (HR) for total fracture (adjusted HR = 2.46), and the obese group had significantly higher HRs for total (adjusted HR = 3.01) and vertebral (HR = 3.77) fractures relative to the reference (overweight) group. No significant associations were observed between BMI and risk of any fracture in women. Higher quartiles of height were associated with higher vertebral fracture risk (adjusted P for trend = 0.023) only in women.
Conclusion
BMI and osteoporotic fracture risk showed a U-shaped association in men, whereas higher height was associated with higher vertebral fracture risk in women, suggesting sex-dependent differences in these associations.
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Acknowledgements
We thank the Murakami Public Health Center, Murakami City Government, Sekikawa Village Government, and Awashimaura Village Government for their valuable support in data collection. This work was supported by JSPS KAKENHI Grant Numbers JP23249035, JP15H04782, and JP19H03897, and the National Cancer Center Research and Development Fund [23-A31(toku) (since 2010)]. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Funding
Japan Society for the Promotion of Science, JP23249035, Kazutoshi Nakamura, JP15H04782, Kazutoshi Nakamura, JP19H03897, Kazutoshi Nakamura, National Cancer Center Research and Development Fund, [23-A31(toku)],Shoichiro Tsugane.
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TN and KN conceived the study; TN, KKi, YW, KKa, ST, KW, and KN designed the study; KKi, YW, AT, TS, RK, RO, RT, OY, and KN conducted research; TN and KN analyzed data; TN and KN wrote the paper draft; and KKa, ST, and KW critically reviewed and revised the manuscript. KN had primary responsibility for the final content. All authors read and approved the final manuscript.
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Nishikura, T., Kitamura, K., Watanabe, Y. et al. Body mass index, height, and osteoporotic fracture risk in community-dwelling Japanese people aged 40–74 years. J Bone Miner Metab 42, 47–59 (2024). https://doi.org/10.1007/s00774-023-01478-z
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DOI: https://doi.org/10.1007/s00774-023-01478-z