X:IT ? evaluation of a school-based intervention to reduce smoking

X:IT - a three-year multi-component, school-based, cluster randomized trial to reduce smoking among 13-15 year olds in Denmark

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN77415416

Enrollment

4468

Registered

2012-04-18

Start date

2010-01-01

Completion date

Unknown

Last updated

2016-10-17

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Smoking Mental and Behavioural Disorders Mental and behavioural disorders due to use of tobacco

Interventions

Students in grade 7, 8 and 9 at 51 intervention schools receive the X:IT intervention program during the school years 2010/11, 2011/12 and 2012/13, whereas students at 43 control schools do not receiv

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: All students at participating schools enrolled in grade 7 at baseline (August 2010)

Exclusion criteria

Exclusion criteria: 1. Schools not run by municipalities 2. Schools for children with special needs

Design outcomes

Primary

Measure	Time frame
1. Frequency of smokers at grade seven, eight and nine measured at baseline, 1,2 and 3 follow-up by student self-reported questionnaires 1.1. Measures of smoking will be supplemented by analyses of number of cigarettes smoked and age at debut 1.2. Frequency of smoking will be analyzed at individual, class and school level	—

Secondary

Measure	Time frame
Intermediate outcomes of the intervention: 1. Individual outcomes: 1.1. Enhanced self-efficacy for smoking 1.2. Increased knowledge about smoking 1.3. Change in norms and attitudes towards smoking 1.4. Performed smoke-free dialogue with parents 2. Group level outcomes 2.1. Increase probability of smoke-free environments at home and at schools 2.2. Changed norms and attitudes against smoking at schools 2.3. Reduce availability of tobacco 2.4. Increase probability of not being exposed to smoking students, teachers and parents Analyses in the project will have a special focus on subgroup analyses especially gender and socioeconomic position. 3. Sustainability 3.1. At second follow-up it will be measured whether participation in Project X:IT has initiated environmental changes and capacity building by questionnaires to project coordinators at schools and in municipalities. Furthermore, we will measure whether the project continues at intervention schools and is initiated at control schools. 4. Differences in frequency of drunkenness and marijuana use between intervention and control schools 5. Differences in students? wellbeing between intervention and control schools	—

Measure

Time frame

Intermediate outcomes of the intervention: 1. Individual outcomes: 1.1. Enhanced self-efficacy for smoking 1.2. Increased knowledge about smoking 1.3. Change in norms and attitudes towards smoking 1.4. Performed smoke-free dialogue with parents 2. Group level outcomes 2.1. Increase probability of smoke-free environments at home and at schools 2.2. Changed norms and attitudes against smoking at schools 2.3. Reduce availability of tobacco 2.4. Increase probability of not being exposed to smoking students, teachers and parents Analyses in the project will have a special focus on subgroup analyses especially gender and socioeconomic position. 3. Sustainability 3.1. At second follow-up it will be measured whether participation in Project X:IT has initiated environmental changes and capacity building by questionnaires to project coordinators at schools and in municipalities. Furthermore, we will measure whether the project continues at intervention schools and is initiated at control schools. 4. Differences in frequency of drunkenness and marijuana use between intervention and control schools 5. Differences in students? wellbeing between intervention and control schools

—

Countries

Denmark

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Mar 20, 2026