The difference in mean change from pre-intervention to post-intervention between intervention and control groups was -0.49 ( 95 % CI : -0.59 , -0.40 ) for depression , -0.43 ( 95 % CI : -0.51 , -0.35 ) for PTS , -0.42 ( 95 % CI : -0.58 , -0.27 ) for functional impairment , -0.48 ( 95 % CI : -0.61 , -0.34 ) for anxiety , -0.24 ( 95 % CI : -0.34 , -0.15 ) for aggression , and -0.03 ( 95 % CI : -0.44 , 0.50 ) for alcohol use .