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Osteoporosis International

, Volume 18, Issue 3, pp 333–337 | Cite as

Latitude, socioeconomic prosperity, mobile phones and hip fracture risk

  • O. Johnell
  • F. Borgstrom
  • B. Jonsson
  • J. KanisEmail author
Original Article

Abstract

Introduction

Epidemiological observations suggest that sunlight exposure is an important determinant of hip fracture risk. The aim of this ecological study was to examine the relationship between latitude and hip fracture probability.

Methods

Hip fracture incidence and mortality were obtained from literature searches and 10-year hip fracture probability computed from fracture and death hazards.

Results

There was a significant association between latitude and 10-year hip fracture probability. For each 10° change in latitude from the equator (e.g., from Paris to Stockholm), fracture probability increased by 0.3% in men, by 0.8% in women and by 0.6% in men and women combined. There was also a significant association between economic prosperity and hip fracture risk as judged by gross domestic product (GDP)/capita or the use of mobile phones/capita. A US $10,000 higher GDP/capita was associated with a 1.3% increase in hip fracture probability. The association between latitude and hip fracture probability persisted after adjusting for indices of economic prosperity.

Conclusions

These findings provide support for an important role of sunlight exposure in the global variation of hip fracture risk. In addition, there is a need to identify the factors related to socioeconomic prosperity that may provide mechanisms for the variation in hip fracture probability worldwide.

Keywords

Hip fracture Latitude Mobile phones Socioeconomic prosperity 

Notes

Acknowledgements

This study was supported by a grant from the International Osteoporosis Foundation.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2006

Authors and Affiliations

  • O. Johnell
    • 1
  • F. Borgstrom
    • 2
  • B. Jonsson
    • 3
  • J. Kanis
    • 4
    Email author
  1. 1.Department of OrthopaedicsMalmo University HospitalMalmoSweden
  2. 2.Stockholm Health EconomicsStockholmSweden
  3. 3.Department of EconomicsStockholm School of EconomicsStockholmSweden
  4. 4.WHO Collaborating Centre for Metabolic Bone DiseasesUniversity of Sheffield Medical SchoolSheffieldUK

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