At follow-up , the mean item change in trauma symptom score was -1.54 ( 95 % CI , -1.81 to -1.27 ) , a reduction of 81.9 % , for the TF-CBT group and -0.37 ( 95 % CI , -0.57 to -0.17 ) , a reduction of 21.1 % , for the TAU group .