UMIN-ICDS Clinical Trial
| Unique ID issued by UMIN | UMIN000061851 |
|---|---|
| Receipt number | R000070769 |
| Scientific Title | App-Based Parent Training to Reduce Child Screen Time: Two-Arm Comparative Study of the Watch Me App |
| Date of disclosure of the study information | 2026/06/09 |
| Last modified on | 2026/06/09 18:09:01 |
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Basic information
Public title
A smartphone app (Watch Me) to help parents reduce young children's screen time
Acronym
Watch Me Study
Scientific Title
App-Based Parent Training to Reduce Child Screen Time: Two-Arm Comparative Study of the Watch Me App
Scientific Title:Acronym
Watch Me Study
Region
| Japan |
Condition
Condition
healthy children
Classification by specialty
| Child |
Classification by malignancy
Others
Genomic information
NO
Objectives
Narrative objectives1
To examine whether the Watch Me app, a smartphone application implementing parent-training techniques, produces a greater short-term reduction in young children's screen time than an active comparison condition (psychoeducation plus a diary-only version of the app). Exploratory analyses examine app-recorded parenting behaviors and day-level parent-child screen time associations as candidate process measures.
Basic objectives2
Others
Basic objectives -Others
Behavior-change intervention to reduce children's screen time
Trial characteristics_1
Exploratory
Trial characteristics_2
Developmental phase
Assessment
Primary outcomes
Child's daily screen time (minutes/day) at the end of the 7-day intervention period, evaluated as the between-group difference adjusted for baseline screen time using analysis of covariance (ANCOVA).
Key secondary outcomes
All assessed as exploratory analyses based on data from the 7-day intervention period. (1) Association between app-recorded parenting behaviors (narration with praise) and change in child screen time; (2) day-level parent-child screen time coupling across the period; (3) association between child affect (happiness/boredom) during the intervention week and the magnitude of screen time reduction.
Base
Study type
Interventional
Study design
Basic design
Parallel
Randomization
Randomized
Randomization unit
Individual
Blinding
Single blind -investigator(s) and assessor(s) are blinded
Control
Active
Stratification
Dynamic allocation
Institution consideration
Blocking
Concealment
Intervention
No. of arms
2
Purpose of intervention
Prevention
Type of intervention
| Other |
Interventions/Control_1
Watch Me group. Participants used the Watch Me smartphone app, which implements evidence-based parent-training techniques (e.g., narration with praise), for 7 days. Parents performed and recorded daily narration with praise toward their child and logged the child's daily screen time. Human support was limited to initial onboarding; no ongoing coaching and no push notifications were provided.
Interventions/Control_2
Active comparison group. Participants received psychoeducation and used a diary-only version of the app for 7 days. Parents logged the child's daily screen time but did not receive the parent-training components (narration with praise). Human support was limited to initial onboarding.
Interventions/Control_3
Interventions/Control_4
Interventions/Control_5
Interventions/Control_6
Interventions/Control_7
Interventions/Control_8
Interventions/Control_9
Interventions/Control_10
Eligibility
Age-lower limit
| 30 | years-old | <= |
Age-upper limit
| 50 | years-old | > |
Gender
Male and Female
Key inclusion criteria
(1) Parent or guardian of an eligible child who provides informed consent to participate. (2) Child within the predefined age range. (3) Child has habitual daily screen use (TV, smartphone, tablet, etc.). (4) Parent owns a smartphone and is able to use the Watch Me app. (5) Able to understand instructions and complete the daily diary in Japanese.
Key exclusion criteria
(1) Child or parent has a serious medical or developmental condition that may affect screen time or parenting behaviors. (2) Currently participating in another similar intervention study. (3) Unable to use a smartphone or to maintain daily diary entries. (4) Otherwise judged ineligible by the principal investigator.
Target sample size
55
Research contact person
Name of lead principal investigator
| 1st name | Chihiro |
| Middle name | |
| Last name | Hosoda |
Organization
Tohoku University
Division name
Graduate School of Information Sciences, T Institute of Development, Aging and Cancer,
Zip code
9808575
Address
senndaishi aobaku seiryo
TEL
0227178507
chihiro.hosoda.d8@tohoku.ac.jp
Public contact
Name of contact person
| 1st name | Mitsuyo |
| Middle name | |
| Last name | Honnma |
Organization
Tohoku University
Division name
Graduate School of Information Sciences, T Institute of Development, Aging and Cancer,
Zip code
9808575
Address
senndaishi aobaku seiryo4-1
TEL
0227955891
Homepage URL
mitsuyo.honma.a8@tohoku.ac.jp
Sponsor or person
Institute
Tohoku University
Institute
Department
Personal name
Funding Source
Organization
JST
Organization
Division
Category of Funding Organization
Japanese Governmental office
Nationality of Funding Organization
Other related organizations
Co-sponsor
Name of secondary funder(s)
IRB Contact (For public release)
Organization
Tohoku University
Address
senndaishi aobaku aramaki
Tel
022(795)5891
is-somu@grp.tohoku.ac.jp
Secondary IDs
Secondary IDs
NO
Study ID_1
Org. issuing International ID_1
Study ID_2
Org. issuing International ID_2
IND to MHLW
Institutions
Institutions
Other administrative information
Date of disclosure of the study information
| 2026 | Year | 06 | Month | 09 | Day |
Related information
URL releasing protocol
Publication of results
Unpublished
Result
URL related to results and publications
Number of participants that the trial has enrolled
55
Results
Results date posted
Results Delayed
Results Delay Reason
Date of the first journal publication of results
Baseline Characteristics
Participant flow
Adverse events
Outcome measures
Plan to share IPD
IPD sharing Plan description
Progress
Recruitment status
Completed
Date of protocol fixation
| 2024 | Year | 06 | Month | 01 | Day |
Date of IRB
| 2024 | Year | 07 | Month | 17 | Day |
Anticipated trial start date
| 2026 | Year | 06 | Month | 09 | Day |
Last follow-up date
| 2027 | Year | 06 | Month | 09 | Day |
Date of closure to data entry
Date trial data considered complete
Date analysis concluded
Other
Other related information
Management information
Registered date
| 2026 | Year | 06 | Month | 09 | Day |
Last modified on
| 2026 | Year | 06 | Month | 09 | Day |
Link to view the page
Value
https://center6.umin.ac.jp/cgi-open-bin/icdr_e/ctr_view.cgi?recptno=R000070769
