During treatment , participants receiving prolonged exposure demonstrated greater improvement on the PTSD symptom severity scale ( difference between treatments in improvement , @ ; @ % CI , @-@ @ ; P < @ ) and on all secondary outcomes ( loss of PTSD diagnosis : difference , @ % , @ % CI , @ % -@ % ; P = @ ; self-reported PTSD severity : difference , @ ; @ % CI , @-@ @ ; P = @ ; depression : difference , @ ; @ % CI , @-@ @ ; P = @ ; global functioning : difference , @ ; @ % CI , @-@ @ ; P = @ ) .