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Estimated calcaneal BMD and proportion of the adult maximum (upper left) by age among Tsimane and American women, as measured by the Sahara Clinical Bone Sonometer. US reference values are provided by the manufacturer based on measurements of 2,208 participants across nine geographical regions. Mean BMD per decade is provided by the manufacturer at decade midpoints. Women below age 20 and above 80 are omitted since comparative data are not available.
