[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100633792":3},{"organization":4,"armGroups":7,"interventions":19,"overallOfficials":24,"centralContacts":28,"locations":18,"responsibleParty":38,"collaborators":18,"id":41,"slug":42,"hasResults":43,"nctId":44,"briefTitle":45,"officialTitle":46,"acronym":18,"eligibilityCriteria":47,"healthyVolunteers":48,"sex":49,"minAge":50,"maxAge":51,"enrollmentInfo":52,"targetDuration":18,"studyType":55,"phases":56,"briefSummary":58,"conditions":59,"keywords":65,"overallStatus":81,"whyStopped":18,"lastUpdateSubmitDate":82,"lastUpdatePostDateStruct":83,"startDateStruct":86,"completionDateStruct":87,"leadSponsor":89,"locationsCount":18},{"fullName":5,"class":6},"University of Southern Denmark","OTHER",[8,14],{"label":9,"type":10,"description":11,"interventionNames":12},"Screen media reduction","EXPERIMENTAL","Peer groups randomized to the intervention will undergo a four-week screen media reduction.",[13],"Behavioral: Screen media reduction",{"label":15,"type":16,"description":17,"interventionNames":18},"Usual screen media use (control)","NO_INTERVENTION","Participants allocated to the control group will be asked not to change their use of screen media devices and continue with their usual screen media behaviors. At the randomization meeting, if a peer group is allocated to the control condition, a researcher will explain the importance of the control group for ensuring the validity of the trial, with the aim of keeping these groups motivated and engaged. Participants in the control group will be offered the screen media reduction intervention after completing the long-term follow-up. Accordingly, they will function as a waitlist control group, although no outcome data will be collected during their subsequent intervention period.",null,[20],{"type":21,"name":9,"description":22,"armGroupLabels":23,"otherNames":18},"BEHAVIORAL","Participants will reduce their recreational screen media use across devices. For smartphone use, participants will be asked to reduce their use to a maximum of 1 hour\u002Fday. Because social media use will not be permitted on computers or tablets during the intervention, this limit will also encompass participants' social media use. Research staff will help each participant set up smartphone app limits for the ten most used social media and gaming applications, add a widget to their home screen showing the current amount of time they have spent on their phone, and turn off non-essential notifications.\n\nFor television, computer and tablet use, participants will reduce their use to 14 hours\u002Fweek (with no specific daily limit), but social media use is not allowed on these devices. We will recommend participants to particularly reduce their solitary screen media use. Participants will be asked to keep their devices outside the bedroom, and they will be provided with a free alarm clock.",[9],[25],{"name":26,"affiliation":5,"role":27},"Anders Grøntved, PhD","PRINCIPAL_INVESTIGATOR",[29,34],{"name":30,"role":31,"phone":32,"phoneExt":18,"email":33},"Jesper Schmidt-Persson, PhD","CONTACT","+4565502054","jespedersen@health.sdu.dk",{"name":35,"role":31,"phone":36,"phoneExt":18,"email":37},"Anne K Gejl, PhD","+4565507908","akgejl@health.sdu.dk",{"type":27,"investigatorFullName":39,"investigatorTitle":40,"investigatorAffiliation":5,"oldNameTitle":18,"oldOrganization":18},"Anders Groentved","Professor","100633792","peerscreen-trial---reducing-screen-media-use-in-peer-groups-of-young-people-100633792",false,"NCT07531290","PeerScreen Trial - Reducing Screen Media Use in Peer-groups of Young People","Effects of Reducing Screen Media Use on Mental Health, Sleep, Physical Activity, Heart Rate Variability, and Behavioral Patterns in Peer-groups of Young People: A Study Protocol for a Cluster-randomized Controlled Trial","Inclusion Criteria:\n\n* Participants must have at least 2 hours\u002Fday of self-reported smartphone use during leisure time (data from the survey study)\n* Members of each participant's household must be willing to support the participant in adhering to the prescribed intervention (data from recruitment interview)\n* Participants must have enough discretionary leisure time for possible in-person activities on a weekly basis throughout the study period (verified at the information meeting)\n\nExclusion Criteria:\n\n* Participants with no smartphone will be excluded (data from recruitment interview)\n* Participants with no social media profiles will be excluded (data from recruitment interview)\n* Participants who currently participate in other experimental studies will be excluded (data from recruitment interview)\n* Participants who have been hospitalized or prescribed sick leave within the past 3 months due to a mental illness will be excluded (data from recruitment interview)",true,"ALL","13 Years","24 Years",{"count":53,"type":54},240,"ESTIMATED","INTERVENTIONAL",[57],"NA","The purpose of the PeerScreen trial is to investigate whether reducing screen media use affects mental health, social interaction, sleep, physical activity, heart rate variability, and behavioral patterns in young people aged 13 to 24 years. The primary question the trial aims to answer is:\n\nDoes reducing screen media use over a 4-week period improve mental health among young people?\n\nResearchers will compare a screen media reduction intervention with a control condition in which participants continue their usual screen media use to determine whether reducing screen media use leads to improvements in mental health.\n\nParticipants will:\n\n* be allocated to either a 4-week screen media reduction intervention or a control condition\n* complete a study protocol including questionnaire-based assessments, daily self-reports, and objective monitoring of screen media use, sleep, physical activity, heart rate variability, social interactions, and geolocation",[60,61,62,63,64],"Mental Health","Social Interaction","Sleep","Physical Activity","Stress",[66,67,68,69,70,71,72,73,74,75,76,77,78,79,80],"digital media use","screen time","adolescent","youth","young adult","mental health","social interaction","behavioral pattern","screen media use","heart rate variability","sleep","physical activity","well being","peer group","interpersonal synchrony","NOT_YET_RECRUITING","2026-04-08",{"date":84,"type":85},"2026-04-15","ACTUAL",{"date":84,"type":54},{"date":88,"type":54},"2027-12-31",{"name":5,"class":6}]