Stepped Versus Stratified Care for Anxiety Disorders in Youth

Inclusion Criteria: 1. Aged 8.0 to 17.5 years. Confirmed by the child and/or caregiver. 2. Principal DSM-5-TR anxiety disorder of social anxiety disorder, generalized anxiety disorder, panic disorder, separation anxiety disorder, specific phobia, or agoraphobia. Confirmed by the structured diagnostic interview (DIAMOND-KID). "Principal" indicates that the anxiety disorder is judged by the clinician to be in most urgent need of treatment (among potential co-occurring disorders). 3. Available caregiver who can support the child in treatment. Confirmed by the caregiver. 4. Child and at least one caregiver can read, write, and communicate in Swedish. Confirmed by the child and/or caregiver. 5. Child (≥13 years) and caregiver have access to a Swedish electronic identification (BankID or Freja eID). 6. Access to the internet. Confirmed by the child and/or caregiver. 7. Ability to attend in-person CBT sessions at the clinic. Confirmed by the child and/or caregiver. Exclusion Criteria: 1. Principal DSM-5-TR anxiety disorder of specific phobia concerning the domain of blood-injection-injury (due to the ICBT program not including relevant information on applied-tension techniques to avoid fainting during exposure exercises). Confirmed by a specific phobia of this sort being classified as the most functionally impairing anxiety disorder during the structured diagnostic interview (DIAMOND-KID). 2. Ongoing psychological treatment for an anxiety disorder. Confirmed by the child and/or caregiver. 3. Social/familial/educational difficulties in more immediate need of management than an anxiety disorder. Confirmed by the assessor through information from the child and/or caregiver and/or other available sources. 4. Immediate risk to self or others that require urgent attention, such as suicidality. Confirmed by the assessor through information from the child and/or caregiver and other available sources. 5. The potential participant has a relative (e.g., sibling, cousin) included in the study. Confirmed by the assessor through information from the caregiver and other available sources.