Mean reduction in observed values of adolescents’ worry as assessed with the PSWQ-C/P from pre-baseline (-10, -6 and -2 weeks respectively), Pre to Post, FU1 and FU3. PSWQ-C/P, Penn State Worry Questionnaire for Children—Child and Parent rated; Pre, pre-treatment; Post, post-treatment; FU1, 1-month follow-up; FU3, 3-month follow-up.