LACHETONPHONE : Impact of a Dedicated Consultation Using a Structured Interview Guide on Screen Time Among Adolescents Aged 12 to 17 in Primary Care

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.

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Key information

Conditions

Screen Time Exposure

Age range

12 year–17 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

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).

Exclusion criteria

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.

Treatment and study plan

Structured Interview Guide

Behavioral

a dedicated consultation with a structured interview guide

Standard practice about screen use prevention for adolescents

Behavioral

Standard practice

Primary outcomes

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.

Study contacts

Contact information is provided by the study sponsor or research team.

Pargol ZANDYAZDI

CONTACT

[email protected]

+33 3 88 11 54 30

Sponsors and collaborators

Lead sponsor

University Hospital, Strasbourg, France

Other

Registry information

Official study 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.

Acronym: LACHETONPHONE

Important dates

Study start: 2026
Primary completion: 2028
Study completion: 2028
First posted: Jul 6, 2026
Registry last updated: Jul 10, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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