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Absolute change from baseline by group (BT, balance and tone; RT1, resistance training once per week; RT2, resistance training twice per week) at the midtibia (50 %) across the three measures of interest. The absolute change from baseline for a cortical volumetric bone mineral density (CovBMD, in milligrams per cubic centimeter), b total area (ToA, in square millimeter), and c bone strength (I max, in millimeter to the fourth power)
