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Some adolescents experience periods of anxiety and/or depression, and some find that these periods return over time. The purpose of this study is to examine whether digital interventions-where individuals work systematically with their own thoughts and feelings during periods when they feel well-can help them maintain well-being for longer.
The study includes adolescents aged 16-19 who have previously experienced episodes of depression and/or anxiety to a degree that led them to seek help (e.g., from a school nurse, general practitioner, health clinic, or child and adolescent mental health service). Through a research app on their smartphones, participants complete tasks and answer questionnaires. The study is fully digital. Some participants meet with a therapist in digital group sessions, while others work independently with the digital content.
We will also examine the cost-benefit aspects of offering such interventions. If the study achieves its goals, digital interventions may eventually become a service offered to adolescents recovering from depression and anxiety.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| App intervention | Experimental | A transdiagnostic, self-guided CBT app:
|
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| Group intervention | Experimental | A transdiagnostic, mastery course for groups, delivered weekly in webinar format over three sessions. It includes videos and group discussions. |
|
| Assessment only | No Intervention | Only assessment will be conducted. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Transdiagnostic app intervention | Behavioral | A transdiagnostic, self-guided CBT app, called TankeVirus (literally translated Thought Viruses), consisting of three components:
|
| Measure | Description | Time Frame |
|---|---|---|
| Relapse: Number of participants scoring above the diagnostic cut-off on the PHQ-9 modified for teens during the 12-month follow-up. | To use the PHQ-9 as a diagnostic aid for Major Depressive Disorder:
| From enrollment to the end of follow-up at 12-months. |
| Time until relapse; reaching the diagnostic criteria of MDD according to PHQ-9 modified for teens | Number of days until the diagnostic criteria of MDD as assessed PHQ-9 modified for teens has been reached. - Questions 1 and/or 2 need to be endorsed as a "2" or "3"
| From enrollment to 12-months follow-up |
| Measure | Description | Time Frame |
|---|---|---|
| Repetitive negative thinking (RNT-10) | Assess transdiagnostic repetitive negative thinking | At enrollment, and at 3, 6 and 12 months follow-up |
| Somatic complaints (SSS8) | Somatic complaints based on sum score of all items |
| Measure | Description | Time Frame |
|---|---|---|
| Client satisfaction questionnaires (CSQ-I) | The 8-item questionnaire assesses how satisfied the participants are with the interventions, only administrated to those who are in the interventional arms. | At 3 months follow-up. |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Ragnhild Bø, Ph.D. | Contact | +47 41904595 | ragnhild.bo@psykologi.uio.no |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Oslo | Oslo | Norway |
|
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| Label | URL |
|---|---|
| Project webpage | View source |
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The dataset underlying the results will be shared together with publications.
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot | Yes | No | No | Study Protocol | Jun 24, 2025 | Dec 22, 2025 | Prot_000.pdf |
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| ID | Term |
|---|---|
| D001008 | Anxiety Disorders |
| D010698 | Phobic Disorders |
| ID | Term |
|---|---|
| D001523 | Mental Disorders |
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| Transdiagnostic mastery course | Behavioral | Group-based webinar offering psychoeducation based on principles of CBT. |
|
| At enrollment, and at 3, 6, and 12-months follow-up. |
| EPOCH Measure of Adolescent Well-Being | A 20-item validated questionnaire (4 items per domain; Engagement, Perseverance, Optimism, Connectedness, Happiness) on a 1-5 Likert scale (1=Almost Never, 5=Almost Always) resulting in domain scores, reflecting strengths in these positive psychological areas crucial for youth well-being. | At baseline, 3, 6 and 12-months follow-up. |
| Health related quality of life | EQ-5D-5L will be used to assess five domains of patient reported outcomes and for economic evaluation of the interventions. | At baseline, 3, 6 and 12-months follow-up. |
| Health related quality of life - Visual Analog Scale | EQ VAS will be used to assess patient reported outcomes for self-rated health and for economic evaluation of the interventions. | At baseline, 3, 6 and 12-months follow-up. |