The T0/T1 comparison showed a statistically significant improvement in headache frequency ( p = 0.005 ) , intensity ( p < 0.001 ) and duration ( p = 0.002 ) , a statistically significant improvement in the CGI score ( p = 0.018 ) , and a borderline improvement in the EuroQoL score ( p = 0.053 ) in the group receiving psychotherapy .