Mean ( SE ) BMD changes were greater in the treatment group : 3.2 ( 0.7 ) and 3.9 ( 0.7 ) percentage-point differences in the total hip at 12 and 24 months , respectively ( P < .01 for both comparisons ) , and 1.8 ( 0.7 ) and 3.6 ( 0.7 ) percentage-point differences at the spine ( P < .01 ) ; adjusted analyses were similar .