Specifically , participants in the decision aid arm had significantly higher scores for general symptoms ( mean difference , 11.0 ; 95 % CI , 5.3 to 16.6 ; P < 0.001 ) and knowledge about benefits of HT ( mean difference , 4.2 ; 95 % CI , 0.03 to 8.5 ; P = 0.048 ) compared with the control arm .