Intention-to-treat analyses at follow-up indicated a significant quadratic timetreatment condition interaction effect ( B [ SE ] , 0.49 [ 0.16 ] ; t120 .16 = 3.08 [ 95 % CI , 0.18-0 .81 ] ; P = .003 ) , indicating that CBT/exposure led to greater PGD reductions than CBT alone .