Extension of the Calcium Intake Fracture Outcome Study

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Osteoporosis is a largely preventable disease yet 1 in 10 Australians have osteoporosis. Every year >64,000 osteoporotic fractures occur, which is one every 8.1 minutes and women are three times as likely to have the disease than men. The Bone and Calcium Research Group at the University of Western Australia, is studying how to prevent osteoporosis in elderly women. This study is called the Calcium Intake Fracture Outcome Study or CAIFOS. During 1998, 1,500 women were recruited to study whether a daily calcium supplement for 5 years helps to prevent fractures compared to a diet without a supplement. To do this only half of the women were given calcium supplements and the other half were given matched placebo tablets. Each year the study participants are reviewed and asked whether or not they have broken any bones and have other measurements to monitor their bone health and overall health. The subjects are entering their last year of treatment and will finish the study during 2003. At this appointment all subjects will undergo the same series of measurements that they had at the beginning of the study to determine whether or not they have fractured any bones, improved their bone mass and overall health during the treatment stage. The main outcome of the study is to determine whether calcium is useful as a supplement to prevent osteoporotic fracture in elderly women. If this study finds that fewer women fractured in the calcium treated group compared to the non treated group, given that both groups were similar to begin with, we can say that supplementation with calcium prevents fractures. Thus, public health messages about preventing osteoporosis will be able to direct the community to take supplements to prevent a disease that creates pain and disability in later life. The advantage of this study is that it is studying other aspects of these women health, so we can determine whether the calcium is safe to use and improves people's quality of life.