The X:IT II Study - school-based prevention of smoking

The X:IT II Study - A Smoking Intervention aimed at adolescents from low social class background

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN31292019

Enrollment

3000

Registered

2017-10-24

Start date

2017-03-01

Completion date

Unknown

Last updated

2023-11-20

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

Conditions

Smoking prevention Respiratory Smoking prevention

Interventions

The X:IT intervention includes three main components: 1. Completely smoke-free school grounds for both students and teachers during school hours and other school-related events. Law o

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: All students at participating schools enrolled in grade 7 (age 13 years to 15 years)

Exclusion criteria

Exclusion criteria: 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 1.2. Frequency of smoking will be analyzed at individual, class and school level, and stratified by gender and socioeconomic level 2. Degree of implementation after first, second, and third year of intervention by student self-reported questionnaires and project coordinator questionnaires	—

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 1.2. Frequency of smoking will be analyzed at individual, class and school level, and stratified by gender and socioeconomic level 2. Degree of implementation after first, second, and third year of intervention by student self-reported questionnaires and project coordinator questionnaires

—

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. Increased probability of smoke-free environments at home and at schools 2.2. Changed norms and attitudes against smoking at schools 2.3. Reduced availability of tobacco 2.4. Increased 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. Increased probability of smoke-free environments at home and at schools 2.2. Changed norms and attitudes against smoking at schools 2.3. Reduced availability of tobacco 2.4. Increased 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: Feb 21, 2026