Skip to content

Effects of an internet-based cognitive behavioral therapy (iCBT) intervention on preventing major depressive episode among workers: a large scale randomized controlled trial

Effects of an internet-based cognitive behavioral therapy (iCBT) intervention on preventing major depressive episode among workers: a large scale randomized controlled trial - Effects of an internet-based cognitive behavioral therapy (iCBT) intervention on preventing major depressive episode among workers: a large scale randomized controlled trial

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000014146
Enrollment
8272
Registered
2014-07-31
Start date
2015-02-23
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

Subthreshold depression, depressive episode

Interventions

A weekly, 6-session internet learning program which provides psychoeducation of stress management based on cognitive-behavioral technique. Treatment as usual through the in-house Employees Assistance

Sponsors

Department of Mental Health, Graduate School of Medicine, University of Tokyo
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1) Age 20-60 at study entry 2) Men and women 3) Currently employed full-time by the business company 4) Can access the Internet via a PC at home or at workplace

Exclusion criteria

Exclusion criteria: 1) Non-regular or part-time employees 2) Sick leave for 15 or more days for a physical or mental condition in the past 3 months 3) Current treatment for a mental health problem from a mental health professional 4) Major depressive episode in the past month, as ascertained by web-based CIDI 5) Lifetime history of bipolar disorder, as ascertained by CIDI

Design outcomes

Primary

MeasureTime frame
1) Duration before the onset of major depressive episode measured by the web-based self-rated CIDI after randomization until 6 and 12 month follow-up

Secondary

MeasureTime frame
1) Severity of subthresholddepression measured by BDI-II 2) Severity of depression measured by K6 3) Work performance measured by WHO Health and Performance Questionnaire (HPQ) 4) Sick leave days in the past 3 months 5) Work Engagement measured by Utrecht Work Engagement Scale (UWES-9) 6)time preference 7) QOL measured by EQ-5D 8)Original questions

Countries

Japan

Contacts

Public ContactKotaro Imamura

Graduate School of Medicine, University of Tokyo Department of Mental Health

icbt@m.u-tokyo.ac.jp+81-3-5841-3522

Outcome results

None listed

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