Just-in-time delivered planning intervention to reduce alcohol use in adolescents

• Register: ISRCTN
• Last refreshed on: 8 June 2020
• Main ID: ISRCTN52150713
• Date of registration: 02/06/2017
• Prospective Registration: Yes
• Primary sponsor: Swiss Reseach Institute for Public Health and Addiction
• Public title: Just-in-time delivered planning intervention to reduce alcohol use in adolescents
• Scientific title: Efficacy of a just-in-time delivered planning intervention to reduce alcohol use in adolescents with hazardous alcohol consumption: a micro-randomized controlled trial
• Date of first enrolment: 22/06/2017
• Target sample size: 79
• Recruitment status: Completed
• URL: http://isrctn.com/ISRCTN52150713
• Study type: Interventional
• Study design: Micro-randomized controlled trial (Prevention)
• Phase: Not Applicable

Countries of recruitment

Switzerland

Contacts

• Name: Severin Haug

Key inclusion & exclusion criteria

Inclusion criteria:
1. Ownership of a mobile phone
2. Hazardous alcohol use defined by binge drinking: consumption of 5 (male; female: 4) or more alcoholic standard drinks on one or more occasions within 30 days preceding the baseline assessment
3. Aged 16 or over

Exclusion criteria:
1. No alcohol consumption with friends or when going out in the evening
2. Typical drinking time with friends or when going out: in the morning or afternoon
3. Age < 16


Age minimum:
Age maximum:
Gender: Both

Health Condition(s) or Problem(s) studied

Alcohol prevention
Mental and Behavioural Disorders
Mental and behavioural disorders due to use of alcohol

Intervention(s)

Participants receive the just-in-time delivered planning intervention to reduce alcohol use on their typically indicated drinking day at 5pm. The study has an AB/BA crossover design, in which each participant receives the intervention and the control in a randomized order. The randomization sequence will be created using computerized random numbers. There is a period of at least 2 weeks between the intervention and control.

Intervention points in time include:
1. Assessment of state of receptivity and state of vulnerability via SMS text message question (“Are you planning to go out or meet with friend this evening?”) on the typical individually indicated drinking day at 5pm
2. Confirmation of receptivity and vulnerability by a text message reply (“Yes”) from the participant
3. The digital micro intervention where participants can choose one of two predetermined if-then plans to practice sensible drinking via SMS text messaging and another text message prompt to visualize the chosen plan

Control points in time only include 1 and 2.

Follow-up assessments will be conducted 24 hours after the assessment of state of receptivity and vulnerability in both intervention and control points in time.

Primary Outcome(s)

Number of alcoholic standard drinks consumed during the previous evening/night, measured via an SMS text message "How many alcoholic drinks did you have last evening/night?” at 24 hours after the assessment of state of receptivity and vulnerability (i.e., at 5pm the following day)

Secondary Outcome(s)

Binge drinking: consumption of 5 (male) or 4 (female) or more alcoholic standard drinks during the previous evening/night, measured via an SMS text message "How many alcoholic drinks did you have last evening/night?” at 24 hours after the assessment of state of receptivity and vulnerability (i.e., at 5pm the following day)

Secondary ID(s)

17.4.11

Source(s) of Monetary Support

Swiss Research Institute for Public Health and Addiction, Swiss Federal Office of Public Health

Ethics review

Status:
Approval date:
Contact:

Ethics committee of the Faculty of Philosophy at the University of Zurich, 18/04/2017, ref: 17.4.11

Results

• Results available: Yes
• Date Completed: 31/12/2018