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Table 1 Measures, questionnaires and timeline

From: Effectiveness of a complex intervention in reducing the prevalence of smoking among adolescents: study design of a cluster-randomized controlled trial

Instrument Assessment area Timing of assessment
Pre-test questionnaire Baseline prevalence of smoking Before randomization
Baseline data form Student smoking behaviors At baseline
Teacher baseline data form Teacher smoking behaviors and attitudes towards smoking and prevention At baseline
Parent baseline data form Parent smoking behaviors and attitudes towards smoking At baseline
Smoking prevalence form Prevalence of smoking among adolescents After the fourth year of ESO and two years after graduation