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

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.

Study Overview

• Status: Not yet recruiting
• Conditions: Screen Time Exposure
• Intervention / Treatment: Behavioral: Standard practice about screen use prevention for adolescents; Behavioral: Structured Interview Guide

• Study Type: Interventional
• Enrollment (Estimated): 400
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Pargol ZANDYAZDI; Phone Number: +33 3 88 11 54 30; Email: pargol.zandyazdi@chru-strasbourg.fr

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child
• Accepts Healthy Volunteers: No

Description

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.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: Control: Standard Practice; Intervention will be compared to standard practice about screen use prevention for adolescents	Behavioral: Standard practice about screen use prevention for adolescents; Standard practice
Experimental: Experimental: Structured Interview Guide; 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.	Behavioral: Structured Interview Guide; a dedicated consultation with a structured interview guide

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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.	At Baseline and 1-month follow-up (7 consecutive days of measurement at each time point, excluding school holidays)

Collaborators and Investigators

• Sponsor: University Hospital, Strasbourg, France
• Investigators: Principal Investigator: Juliette Dr CHAMBE, Dr, Hopitaux Universitaires de Strasbourg

Study record dates

Study Major Dates

• Study Start (Estimated): October 15, 2026
• Primary Completion (Estimated): August 15, 2028
• Study Completion (Estimated): August 15, 2028

Study Registration Dates

• First Submitted: June 29, 2026
• First Submitted That Met QC Criteria: June 29, 2026
• First Posted (Actual): July 6, 2026

Study Record Updates

• Last Update Posted (Actual): July 10, 2026
• Last Update Submitted That Met QC Criteria: July 8, 2026
• Last Verified: July 1, 2026

More Information

Terms related to this study

• Other Study ID Numbers: 9461; 2025-A01775-44 (Other Identifier: N° IDRCB)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No