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

NCT07685951 | Not Yet Recruiting

• 2 other identifiers: 94612025-A01775-44
• Study Type: interventional
• Target: 400
• Locations: 0 countries
• Sites: N/A

Brief 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. 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

Outcome Measures

Primary Outcomes (1)

• 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)

Study Arms (2)

Control: Standard Practice

OTHER

Intervention will be compared to standard practice about screen use prevention for adolescents

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.

Behavioral: Structured Interview Guide

Interventions

Structured Interview Guide BEHAVIORAL

a dedicated consultation with a structured interview guide

Experimental: Structured Interview Guide

Standard practice about screen use prevention for adolescents BEHAVIORAL

Standard practice

Control: Standard Practice

Eligibility Criteria

• Age: 12 Years - 17 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17)

You may qualify if:

• 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.
• \- Adolescent affiliated with a health insurance plan (either as the beneficiary or dependent).

You may not qualify if:

• 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.

Sponsors & Collaborators

• University Hospital, Strasbourg, France: lead

Study Officials

• Juliette Dr CHAMBE, Dr

  HOPITAUX UNIVERSITAIRES DE STRASBOURG

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Pargol ZANDYAZDI

CONTACT

+33 3 88 11 54 30; pargol.zandyazdi@chru-strasbourg.fr

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: PREVENTION
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 29, 2026
• First Posted: July 6, 2026
• Study Start (Estimated): October 15, 2026
• Primary Completion (Estimated): August 15, 2028
• Study Completion (Estimated): August 15, 2028
• Last Updated: July 10, 2026

Record last verified: 2026-07