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Published in: Archives of Osteoporosis 1/2016

01-12-2016 | Original Article

Forearm fractures in Central Norway, 1999–2012: incidence, time trends, and seasonal variation

Authors: Mari Hoff, Ingrid Ask Torvik, Berit Schei

Published in: Archives of Osteoporosis | Issue 1/2016

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Abstract

Summary

The incidence of forearm fractures for men and women ≥40 years in Central Norway was high during the period 1999–2012. A decline in fractures was observed only among women over 50 years. A seasonal variation with highest incidence in the winter months was found among women.

Purpose

The aim of this study was to examine the incidence of forearm fractures in Central Norway in men and women 40 years and older from 1999 to 2012 and assess time trends as well as seasonal variations.

Methods

Data is from the fracture registry in Nord-Trøndelag, including all forearm fractures in persons ≥40 sustained from 1999 to 2012. Annual incidence of forearm fractures were calculated and tested for trends. Variations in the occurrence of fractures were explored by comparing proportion of fractures by month and seasons.

Results

The study population consisted of 4003 subjects (77.1 % women). The total number of fractures were 4240. There was an increase in fractures for women with increasing age, steepest, a three-fold increase between age group 40–50 and the age group 50–60. Among men, this pattern was not observed as incidences did not change with increasing age. The age-standardized incidence rate for all fractures among women ≥50 ranged from 82 fractures per 1000 (95 % CI 71–94) to 100 (88–114) and among men from 19 (14–27) to 31 (24–39).
Restricting the analysis to the first fracture sustained during the observed period, women ≥50 years showed a reduction in fractures of 1.30 % per year (95 % CI 0.01 %: 2.56 %,) and 12.18 % per 10 years (3.61 %: 19.98 %). For all women, there was a trend towards a decline of 0.73 % per year (−2.29 %: 0.85 %), although not significant. For men, there was a trend towards an increase in fractures of 1.66 % per year (−0.11 %: 3.45 %). The occurrence of fractures among women varied by season of the year, with higher fracture rates in the winter months.

Conclusions

The incidence rate of forearm fractures in Central Norway was high. However, a small decline in the incidence of the first fracture among women older than 50 years was observed. Fractures were more often sustained during winter months among women.
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Metadata
Title
Forearm fractures in Central Norway, 1999–2012: incidence, time trends, and seasonal variation
Authors
Mari Hoff
Ingrid Ask Torvik
Berit Schei
Publication date
01-12-2016
Publisher
Springer London
Published in
Archives of Osteoporosis / Issue 1/2016
Print ISSN: 1862-3522
Electronic ISSN: 1862-3514
DOI
https://doi.org/10.1007/s11657-016-0257-4

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