• Clinical Severity Rating on Anxiety Diagnostic Interview Schedule for Children for primary anxiety disorder [ Time Frame: Measured at pre-treatment and post-treatment ] [ Designated as safety issue: No ]
  

• Clinical Global Impression scale-Improvement Change [ Time Frame: Measured at pre-treatment, mid-treatment, post-treatment, and a 3-month follow-up ] [ Designated as safety issue: No ]
  
• Screening for Anxiety Related Emotional Disorders (SCARED) parent and child self-report scales [ Time Frame: Measured at pre-treatment, mid-treatment, post-treatment, and a 3-month follow-up ] [ Designated as safety issue: No ]
  

Approximately 13% of adolescents aged 9 to 17 suffer from an anxiety disorder, which can cause disruptive fear, worry, or uneasiness that impairs their normal functioning. These anxiety disorders can include generalized anxiety disorder (GAD), phobias, panic disorder, and obsessive-compulsive disorder (OCD), and they often co-occur with a second anxiety disorder or another mental or behavioral disorder, like depression. Research on interventions such as cognitive behavioral therapy (CBT) indicates that these interventions are helpful to children who suffer from anxiety disorders, but are not always used. This study will examine the feasibility of implementing CBT for children between the ages of 8 and 13 in two different forms: through in-person contact at the pediatric primary care setting and through telephone-based contact.

Participants in this study will be randomly assigned to receive either cognitive behavioral therapy in primary care (CBT-PC) or therapist-assisted bibliotherapy in primary care (TAB-PC). In CBT-PC, participants will have therapy administered by a child anxiety specialist, and the parents of participants will learn how to support the new skills their children learn in therapy. In TAB-PC, parents will receive educational workbooks and ongoing support over the phone from a child anxiety specialist to learn how to use CBT skills to manage their children's fears and worries. Participation in this study will last 3 to 4 months, with therapy visits occuring once a week at the beginning and tapering to once every other week at the end of treatment. At pre-treatment, mid-treatment, post-treatment, and a 3-month follow-up, participants will undergo structured clinical interviews to assess their anxiety levels and the severity of their conditions.