High Schools- High on Life: an Intervention to Reduce Excessive Drinking in Danish High Schools

Due to the corona-crisis, we asses that it is not possible to carry out the effect-measurement as planned. The lockdown has strongly affected the young people's social life and alcohol use that could hide possible effects of the intervention.

High schools High on life' intervention is a high school-based, multi-component intervention guided by theory, evidence, and empirical findings to reduce excessive drinking among Danish high school students. The study will employ a cluster-randomized controlled study design: investigators plan to include a random sample of at least 12 high schools randomly 1:1 allocated to either intervention or control group. Timeline: Baseline data will be obtained from the Danish National Youth Study 2019, collected in January to March 2019. Delivery of intervention: August 2019 to January 2020. Follow-up survey: April to May 2020. Primary outcome measure: mean number of binge-drinking episodes within the last 30 days. Secondary outcome measures: weekly alcohol consumption, alcohol intake at last school party, alcohol intake at the school during last school party, number of students that agrees that they are able to have fun at a party without drinking, and the proportion of students that think alcohol plays a too dominant part at the school. Implementation will be monitored thorough process evaluation.

High schools High on life' intervention is a high school-based, multi-component intervention guided by theory, evidence, and empirical findings to reduce excessive drinking among Danish high school students. The study will employ a cluster-randomized controlled study design: based on sample size calculations investigators plan to include a random sample of at least 12 high schools randomly 1:1 allocated to either intervention or control group. Timeline: Baseline data will be obtained from the Danish National Youth Study 2019, collected in January to March 2019. Delivery of intervention: August 2019 to January 2020. Follow-up survey: April to May 2020. Primary outcome measure: mean number of binge-drinking episodes within the last 30 days. Secondary outcome measures: weekly alcohol consumption, alcohol intake at last school party, alcohol intake at the school during last school party, number of students that agrees that they are able to have fun at a party without drinking, and the proportion of students that think alcohol plays a too dominant part at the school. Implementation will be monitored thorough process evaluation.

The study will employ a cluster-randomized controlled study design: investigators plan to include a random sample of at least 12 high schools randomly 1:1 allocated to either intervention or control group.

The intervention consist of three main components. School environmental component The component targeting the high school environment consisted of two separate elements: Revision of school alcohol policy Appointment of coordinator(s) of student committees organizing events, where alcohol is sold, and student introduction committee. Student components The Student components consisted of three main elements: Web-based education for the student committees organizing events where alcohol is sold and the student introduction committee Pocket movie campaign Social norms campaign Parent components The parent component consisted of three separate elements: Parent Information Meeting Parent Information Folder Parent Information Website

Control high schools was asked to continue business as usual and promised to receive the intervention in the school year starting in 2020

The intervention consist of three main components. Environmental factors of the school environment The component targeting the high school environment consisted of two separate elements: Revision of school alcohol policy Appointment of coordinator(s) of student committees organizing events, where alcohol is sold, and student introduction committee. Student component The Student components consisted of three main elements: Online education for the student committees organizing events where alcohol is sold and the student introduction committee Pocket movie campaign competition Social norms campaign Parent component The parent component consisted of three separate elements: Parent Information Meeting Parent Information Folder Parent Information Website

Proportion of students who feel included in the social community at school, including students that do not drink or have a low alcohol intake

Inclusion Criteria: Enrolled in High school that participate in The Danish National Youth Study 2019 General High Schools Exclusion Criteria: non General High schools students non participation in The Danish National Youth Study 2019

Pisinger VSC, Hoffmann SH, Palsson L, Dalum P, Gronbaek MK, Tolstrup JS, Thygesen LC, Krolner RF. 'High schools High on life': Development of an Intervention to Reduce Excessive Drinking in Danish High Schools. Front Public Health. 2020 Sep 15;8:435. doi: 10.3389/fpubh.2020.00435. eCollection 2020.

Pisinger VSC, Hoffmann S, Rosing JA, Gronbaek M, Tolstrup JS, Thygesen L, Krolner R. Study protocol for a cluster randomised controlled trial testing the effectiveness of the 'High schools High on life' intervention on reducing excessive drinking in Danish high schools. BMJ Open. 2020 Aug 6;10(8):e038857. doi: 10.1136/bmjopen-2020-038857.