The LS mean estimates of the percent change from baseline for placebo ( -@ % ) was nominally smaller than @ mg PGB-CR ( -@ % , p = @ ) and @ mg PGB-CR ( -@ % , p = @ ) ; however , the median percent changes from baseline were not as well differentiated ( placebo , -@ % ; @ mg PGB-CR , -@ % ; @ mg PGB-CR -@ % ) .