Screen Time ExposureLACHETONPHONENCT07685951
LACHETONPHONE : Impact of a Dedicated Consultation Using a Structured Interview Guide on Screen Time Among Adolescents Aged 12 to 17 in Primary Care
A study testing Structured Interview Guide and Standard practice about screen use prevention for adolescents in people with Screen Time Exposure, run by University Hospital, Strasbourg, France.
Trial summary
Adolescents spend a large amount of time on screens, especially smartphones. Excessive screen use has been linked to health problems such as poor sleep, reduced physical activity, academic difficulties, and mental health issues. Read more about this study
- Who is it for?
- Ages 12 to 17 years
- Conditions the study is for
- Screen Time Exposure
- What is being tested?
- Structured Interview Guide and Standard practice about screen use prevention for adolescents
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 400 participants
- Where
- No sites listed yet
- Study dates
- 15 Oct 2026to 15 Aug 2028
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 12 to 17 years
- All sexes
- No healthy volunteers
- Child
Who may be able to join
- Adolescent aged 12 to 17 years at the time of enrolment (participants aged 17 must not have turned 18 on the day of inclusion).
- Adolescent owning a smartphone, with usage >14 hours/week and a score >10/21 on the early overexposure screening questionnaire (e-KID).
- Adolescent and parent(s) or legal guardian(s) able to understand the objectives of the research.
- Adolescent whose parent(s) or legal guardian(s) have signed an electronic informed consent (e-Consent) prior to any study-related procedures.
- (The minor's signature will be sought but is not mandatory. In accordance with Article L1122-2, consent from one parent/legal guardian is sufficient for inclusion and data analysis; however, consent from both parents will be systematically sought.)
- Adolescent affiliated with a health insurance plan (either as the beneficiary or dependent).
Who cannot join
- Adolescent with severe psychiatric disorders (DSM-V diagnosis and/or treatment with amphetamines, neuroleptics, or psychotropic drugs).
- Adolescent currently excluded from participation due to a previous or ongoing study.
- Adolescent under legal guardianship or conservatorship (tutelle or curatelle).
- Adolescent female who is pregnant or breastfeeding (self-reported).
- Adolescent under judicial protection (sauvegarde de justice).
- Adolescent in an emergency situation, with comprehension difficulties, or cognitive impairment.
- Adolescent who does not speak or understand French.
- Adolescent who opposes participation in the study.
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
Official title: LACHETONPHONE : Impact of a Dedicated Consultation Using a Structured Interview Guide on Screen Time Among Adolescents Aged 12 to 17 in Primary Care: a Multicenter Randomized Study.
Adolescents spend a large amount of time on screens, especially smartphones. Excessive screen use has been linked to health problems such as poor sleep, reduced physical activity, academic difficulties, and mental health issues. Primary care professionals often lack practical tools to help young people address this problem.
This study aims to evaluate whether a dedicated medical consultation (DC), using a structured interview guide and a screening questionnaire (e-KID), can help adolescents aged 12 to 17 reduce and improve their screen use. When excessive screen exposure is identified, adolescents are offered a personalized consultation with a healthcare professional. Together, they discuss screen habits, health impacts, and set achievable goals to change usage patterns.
The investigator hypothesizes that adolescents who receive this dedicated consultation by healthcare providers trained with a specific grid will better reduce their smartphone screen time and adopt healthier screen use habits compared to those receiving usual care.
- Conditions
- Screen Time Exposure
- Being tested
- Structured Interview Guide, Standard practice about screen use prevention for adolescents
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Structured Interview GuideBehavioural
a dedicated consultation with a structured interview guide
Standard practice about screen use prevention for adolescentsBehavioural
Standard practice
| Study group | Role | What they receive |
|---|---|---|
| Control: Standard Practice | Other | Intervention will be compared to standard practice about screen use prevention for adolescents Receives: Behavioral: Standard practice about screen use prevention for adolescents |
| Experimental: Structured Interview Guide | Experimental | The investigators in the experimental group will be trained in the specific interview framework for the dedicated consultation; they will be required to confirm that they have read and understood how to use it. They will base their dedicated consultation on this interview framework. Receives: Behavioral: Structured Interview Guide |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in time spent on the smartphone, measured in hours and minutes (recorded via screenshots), between the baseline visit and one month later, over a period of 7 consecutive days and outside school holidays, in both groups.
Change in time spent on smartphone use, measured in hours and minutes, assessed via participant screenshots of screen-time statistics. Smartphone use will be recorded over 7 consecutive consecutive days at each time point (baseline and 1 month), excluding school holidays, in both intervention and control groups.
Measured: At Baseline and 1-month follow-up (7 consecutive days of measurement at each time point, excluding school holidays)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted6 Jul 2026
- Study start15 Oct 2026 (estimated)
- Primary completion15 Aug 2028 (estimated)
- Study completion15 Aug 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Screen Time ExposureStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 400 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University Hospital, Strasbourg, France
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Juliette Dr CHAMBE, Dr, Principal investigator, HOPITAUX UNIVERSITAIRES DE STRASBOURG
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07685951
- Sponsor's protocol ID
- 9461
- Other IDs
- 2025-A01775-44
- Acronym
- LACHETONPHONE
- Status last verified
- Jul 2026
- First submitted
- 29 Jun 2026
- Last updated
- 10 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 10 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- LACHETONPHONE : Impact of a Dedicated Consultation Using a Structured Interview Guide on Screen Time Among Adolescents Aged 12 to 17 in Primary Care: a Multicenter Randomized Study.
- ClinicalTrials.gov ID
- NCT07685951
- Acronym / sponsor ID
- LACHETONPHONE / 9461
- Conditions
- Screen Time Exposure
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 400 participants (estimated)
- Lead sponsor
- University Hospital, Strasbourg, FranceUniversity, hospital or other
- Study start
- 15 Oct 2026 (estimated)
- Primary completion
- 15 Aug 2028 (estimated)
- Study completion
- 15 Aug 2028 (estimated)
- First posted
- 6 Jul 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Adolescents spend a large amount of time on screens, especially smartphones. Excessive screen use has been linked to health problems such as poor sleep, reduced physical activity, academic difficulties, and mental health issues. Primary care professionals often lack practical tools to help young people address this problem.
This study aims to evaluate whether a dedicated medical consultation (DC), using a structured interview guide and a screening questionnaire (e-KID), can help adolescents aged 12 to 17 reduce and improve their screen use. When excessive screen exposure is identified, adolescents are offered a personalized consultation with a healthcare professional. Together, they discuss screen habits, health impacts, and set achievable goals to change usage patterns.
The investigator hypothesizes that adolescents who receive this dedicated consultation by healthcare providers trained with a specific grid will better reduce their smartphone screen time and adopt healthier screen use habits compared to those receiving usual care.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Control: Standard Practice | Other | Behavioral: Standard practice about screen use prevention for adolescentsIntervention will be compared to standard practice about screen use prevention for adolescents |
| Experimental: Structured Interview Guide | Experimental | Behavioral: Structured Interview GuideThe investigators in the experimental group will be trained in the specific interview framework for the dedicated consultation; they will be required to confirm that they have read and understood how to use it. They will base their dedicated consultation on this interview framework. |
Who may qualify
- Ages
- 12 to 17 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child
Key inclusion criteria (6 listed)
- Adolescent aged 12 to 17 years at the time of enrolment (participants aged 17 must not have turned 18 on the day of inclusion).
- Adolescent owning a smartphone, with usage >14 hours/week and a score >10/21 on the early overexposure screening questionnaire (e-KID).
- Adolescent and parent(s) or legal guardian(s) able to understand the objectives of the research.
- Adolescent whose parent(s) or legal guardian(s) have signed an electronic informed consent (e-Consent) prior to any study-related procedures.
- (The minor's signature will be sought but is not mandatory. In accordance with Article L1122-2, consent from one parent/legal guardian is sufficient for inclusion and data analysis; however, consent from both parents will be systematically sought.)
Key exclusion criteria (8 listed)
- Adolescent with severe psychiatric disorders (DSM-V diagnosis and/or treatment with amphetamines, neuroleptics, or psychotropic drugs).
- Adolescent currently excluded from participation due to a previous or ongoing study.
- Adolescent under legal guardianship or conservatorship (tutelle or curatelle).
- Adolescent female who is pregnant or breastfeeding (self-reported).
- Adolescent under judicial protection (sauvegarde de justice).
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Structured Interview Guidea dedicated consultation with a structured interview guide | Behavioural | Experimental: Structured Interview Guide |
| Standard practice about screen use prevention for adolescentsStandard practice | Behavioural | Control: Standard Practice |
Primary outcome
Change in time spent on the smartphone, measured in hours and minutes (recorded via screenshots), between the baseline visit and one month later, over a period of 7 consecutive days and outside school holidays, in both groups.
Time frame: At Baseline and 1-month follow-up (7 consecutive days of measurement at each time point, excluding school holidays)
Change in time spent on smartphone use, measured in hours and minutes, assessed via participant screenshots of screen-time statistics. Smartphone use will be recorded over 7 consecutive consecutive days at each time point (baseline and 1 month), excluding school holidays, in both intervention and control groups.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Jul 2026.
- Individual participant dataSharing planned: Undecided
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Juliette Dr CHAMBE, Dr principal investigator
HOPITAUX UNIVERSITAIRES DE STRASBOURG
Questions about this trial
What is this clinical trial studying?
A study testing Structured Interview Guide and Standard practice about screen use prevention for adolescents in people with Screen Time Exposure, run by University Hospital, Strasbourg, France.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 10 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Pargol ZANDYAZDI (+33 3 88 11 54 30, pargol.zandyazdi@chru-strasbourg.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in time spent on the smartphone, measured in hours and minutes (recorded via screenshots), between the baseline visit and one month later, over a period of 7 consecutive days and outside school holidays, in both groups. (time frame: At Baseline and 1-month follow-up (7 consecutive days of measurement at each time point, excluding school holidays)). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jul 2026.