A 10-week internet-delivered cognitive behavioral therapy program cut anxiety symptoms in children ages 10–13 and improved functional ability more effectively than passive educational content, according to a randomized trial from the University of Turku's Research Center for Child Psychiatry published in JAMA Network Open. The 465-participant study, which screened children during routine school health checkups, also documented a delayed treatment effect — symptom reduction and functional gains continued strengthening 6 to 12 months after the active intervention ended.
The Signal and the Separation
Both arms improved. The relevant metric is the differential.
- Cohort: 465 Finnish children, ages 10–13, identified via annual school health screenings
- Intervention: Master Your Worries program (10-week online modules with parent track and weekly phone coaching)
- Comparator: digital materials on anxiety, well-being, and healthy lifestyles
- Primary endpoint: anxiety symptoms and functional ability at 1-year and 2-year follow-ups
- Key finding: significantly greater symptom reduction and functional improvement in the intervention arm; the largest absolute gains in children with more severe baseline symptoms
"The difference was evident in both the children's own assessments and their parents' assessments at the one-year and two-year follow-ups. It was particularly interesting to note that the effects of the therapy continued to strengthen between six and 12 months, even though the actual treatment period had already ended," says doctoral researcher Katri Kaajalaakso.
The trial's authors attribute the post-treatment amplification to the consolidation of CBT-derived cognitive and behavioral patterns into daily routines — a delayed treatment effect consistent with how practiced skills propagate through habitual behavior over time.
Protocol Architecture
The Master Your Worries design rests on three operational levers:
- Active dyadic participation. The child works through online modules with parental support; parents have a parallel resource track.
- Structured guidance. Weekly telephone coaching across the 10-week window.
- Remote delivery. Internet-based administration bypasses the geographic and workforce constraints documented in pediatric mental health services.
"The ways of thinking and behaving learned through cognitive behavioral therapy can gradually become part of the child's and the whole family's everyday life. Therefore, the positive effects of the treatment may continue to strengthen long after the actual therapy has ended," says principal investigator Professor Andre Sourander.
Secondary signal: parents in the intervention arm reported improved well-being, suggesting the program operates on the family system rather than the child in isolation.
What to Track
The context is load-bearing. An estimated 6%–18% of school-age children and adolescents meet criteria for an anxiety disorder, with global prevalence among young people rising over the past decade. The concurrent shortage of pediatric mental health professionals means the majority of affected children are not receiving evidence-based care — a treatment-latency gap that remote, structured interventions are positioned to compress.
For clinicians and parents, the operational takeaway is narrow and measurable: screen early through school health services or primary care, refer to a structured remote CBT protocol with active parent involvement, and track outcomes at 6, 12, and 24 months. The control arm also improved — generic content is not inert — but the magnitude across reported endpoints favors active, coached, family-inclusive delivery on every metric the study measured.