Likewise for those who started with T-scores of less than -@ , mean change of spine bone mineral density at @ years did not differ significantly between the exemestane and anastrozole treatment groups ( @ % , @ % CI -@ to @ vs @ % , @ % CI @ to @ ; p = @ ) , nor did hip bone mineral density ( @ % , @ % CI -@ to @ vs @ % , @ % CI -@ to @ ; p = @ ) .