The book "Variability of Bone Mineral Density in Elderly Postmenopausal Women" by John Scariano provides a comprehensive analysis of the factors that influence the variability of bone density in older, postmenopausal women. It includes two previously published manuscripts as well as a third report that has been submitted for publication. The dissertation examines the biochemical and genetic aspects that help explain the differences in bone density measured by dual-energy X-ray absorptiometry. The work is based on a study involving 226 healthy older women and highlights the diagnostic effectiveness of biochemical markers of bone metabolism. Each manuscript is introduced with a preface and presented in a separate chapter, providing a clear structure and easy access to the information.