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Child Mental Health Cohort Study

Transdiagnostic child mental health trajectories in Japan: a nationwide web-based longitudinal open cohort study - J-TRAC (Japan Transdiagnostic Research on Adolescent and Child Mental Health)

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
JPRN
Registry ID
JPRN-UMIN000060464
Enrollment
7000
Registered
2026-01-28
Start date
2026-02-01
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Child and adolescent mental health problems (transdiagnostic mental health symptoms) and neurodevelopmental disorders

Interventions

None listed

Sponsors

The University of Osaka
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Caregivers and their children residing in Japan Caregivers aged 18 years or older Children aged from birth (0 years) to 18 years at enrollment Ability to participate in web-based surveys Provision of electronic informed consent (and assent, where applicable)

Exclusion criteria

Exclusion criteria: Inability to understand the study information or complete questionnaires in Japanese Inability to participate in web-based surveys using a smartphone, tablet, or computer Any condition judged by the investigators to make participation inappropriate

Design outcomes

Primary

MeasureTime frame
Longitudinal changes in child and adolescent mental health indicators assessed using validated standardized questionnaires (e.g., Strengths and Difficulties Questionnaire [SDQ], Patient Health Questionnaire-9 [PHQ-9/PHQ-9a], and Generalized Anxiety Disorder-7 [GAD-7]) at baseline and annual follow-up assessments.

Secondary

MeasureTime frame
Key secondary outcomes assessed at baseline and annual follow-up include: Incidence or worsening of mental health problems based on questionnaire scores exceeding established clinical cut-offs; Caregiver-reported new diagnoses of mental disorders; School attendance and school functioning; Differences in mental health trajectories according to neurodevelopmental disorder status; Associations between mental health indicators and familial, school, and psychosocial factors; Associations between genetic indicators (in participants providing saliva samples) and mental health outcomes.

Countries

Japan

Contacts

Public ContactTakashi Yamada

The University of Osaka United Graduate School of Child Development

yamada.takashi.ugscd@osaka-u.ac.jp06-6879-3347

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026