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Risk Factors for Hip Fracture and a Possible Effect Modification by Hormone Replacement Therapy. The Danish Nurse Cohort Study

  • Locomotor Diseases
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Abstract

Objective: To identify risk factors for hip fracture and to examine whether hormone replacement therapy (HRT) modifies the effect of these risk factors. Design: Prospective cohort study. Setting: The Danish Nurse Cohort Study. Participants: 14,015 female nurses aged 50 years and above who in 1993 completed a questionnaire on general health and lifestyle issues, reproductive history including information on HRT, and family history of osteoporosis and personal history of a wrist fracture. Outcome measures: End-point was the first-ever hip fracture registered in the Danish National Hospital Register during the period from 1993 to 1999. Results: During the follow-up period 245 hip fractures were identified. Ever users of HRT had a lower risk of hip fracture (hazard ratio 0.69; 0.50–0.94). Women reporting a poor health (hazard ratio 2.01; 1.30–3.11), restrictions in daily activities (hazard ratio 1.52; 1.05–2.21), low body mass index (hazard ratio 1.65; 0.98–2.77), and leisure time sedentary physical activity (hazard ratio 1.88; 1.30–2.70) were main identified risk factors for hip fracture. HRT did not modify the effect of risk factors on the risk of hip fracture. Conclusion: This study confirms that women with a frail health are at increased hip fracture risk and that ever use of HRT decreases the risk of hip fracture. HRT did not modify the effect of these risk factors, indicating that the preventive effect of this therapy is independent of risk factors.

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Authors and Affiliations

  1. The Danish Nurse Cohort Study, National Institute of Public Health, Copenhagen, Denmark

    Yrsa Andersen Hundrup, Ola Ekholm, Michael Davidsen & Erik Bernhard Obel

  2. Research Unit for Dietary Studies, Institute of Preventive Medicine, Copenhagen, Denmark

    Susanne Høidrup

Authors
  1. Yrsa Andersen Hundrup
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  2. Ola Ekholm
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  3. Susanne Høidrup
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  4. Michael Davidsen
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  5. Erik Bernhard Obel
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Correspondence to Yrsa Andersen Hundrup.

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Hundrup, Y.A., Ekholm, O., Høidrup, S. et al. Risk Factors for Hip Fracture and a Possible Effect Modification by Hormone Replacement Therapy. The Danish Nurse Cohort Study. Eur J Epidemiol 20, 871–877 (2005). https://doi.org/10.1007/s10654-005-2151-z

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