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Frequency distribution of BSU.Pf.N/Tb.Pf.Ar and Cm.Ln.Pm/Tb.Pf.Ar within L2 vertebrae from 8 younger women (aged 19-38 yr) and 8 older women (aged 69-96 yr). The frequency plots are not normalized to account for different numbers of trabecular profiles measured per individual; however, the p-values are for the nested analyses (GROUP → INDIVIDUAL → TRABECULAR PROFILE) which do. Abbreviation: BSU, bone structural unit.
