Abstract
Introduction
A retrospective cohort study was performed to investigate if incidence rates of first hip fractures are changing in a Danish county. Study material was obtained from an excerpt from a computerized national health register and covers the period 1987–1997.
Methods
First hip fractures were identified through a search 10 years back from the date of admission. To assess the 20-year trend, 1978 data were included. The study period saw inclusion of 3,036 first (1987–1997) and 122 first and recurrent (1978) hip fracture patients aged 50 years and older. Data were analyzed using weighted regression analysis.
Results
Age-adjusted first hip fracture incidence rates increased significantly (P<0.001) for women, men, and pertrochanteric fractures. The rate of increase was 18 [95% confidence interval (CI), 12–25], 8 (95% CI, 4–12), and 10 (95% CI, 7–12) per 100,000 per year for women, men, and pertrochanteric fractures, respectively. The age-adjusted rate for both genders combined was 425 per 100,000 in 1997 (95% CI, 380–470). The incidence of cervical fractures was stable. If the rates of 1978 were included in the analysis, the cervical hip fractures also increased (P<0.001). The weighted average of female–male ratio was a stable 2.6 (95% CI, 2.4–2.8). Cervical–pertrochanteric ratio dropped to 1.2:1 (P<0.001). Mean age at admission rose from 78.9 to 80.8 years.
Conclusion
In conclusion, the results provided support for an increasing incidence of first hip fractures, even when aging of the population was accounted for.
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Acknowledgements
This study was conducted as a part of my education at the Master of Public Health Program at Aarhus University. Professor Michael Vaeth, PhD, was my advisor and provided statistical support. Lecturer Svend Juul, MD, Department of Epidemiology and Social Medicine, University of Aarhus, gave technical advice on computer programming. I am grateful for their contributions. The study was in part supported by The Viborg County Research Foundation for Social and Health Issues, The Health Administration of Viborg County, Hans and Nora Buchard’s Foundation, and The Foundation of Alfred Helsted, chief physician and DMSc, and Eli Moller, DMSc.
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Giversen, I.M. Time trends of age-adjusted incidence rates of first hip fractures: a register-based study among older people in Viborg County, Denmark, 1987–1997. Osteoporos Int 17, 552–564 (2006). https://doi.org/10.1007/s00198-005-0012-y
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DOI: https://doi.org/10.1007/s00198-005-0012-y