The D-cycloserine plus CT group showed a significant improvement in median TFI score ( -5.8 [ 95 % CI , -9.4 to -1.1 ] ) and self-reported cognitive deficits ( -4.5 [ 95 % CI , -11.5 to -1.0 ] ) , but the placebo group did not ( -1.0 [ 95 % CI , -11.7 to 4.9 ] and -2.0 [ 95 % CI , -5.1 to 2.0 ] , respectively ) .