Introduction

The GYTS is a school-based survey that collects data on students aged 13–15 years using a standardized methodology for constructing the sample frame, selecting schools and classes, and processing data. The GYTS surveillance system is intended to enhance the capacity of countries to design, implement, and evaluate tobacco control and prevention programs. Funding for the GYTS has been provided by the Canadian Public Health Association, National Cancer Institute, United Nations Children Emergency Fund, and the World Health Organization—Tobacco Free Initiative.

Methodology

• School-based survey of students aged 13–15 years
• Multistage sample design with schools selected proportional to enrollment size
• Classrooms chosen randomly within selected schools
• All students in selected classes eligible for participation
• Anonymous and confidential self-administered questionnaire
• Countries may add questions to the questionnaire
• Computer-scannable answer sheets
• Requires only 30–40 minutes to administer
• Fieldwork conducted in 6–8 weeks
• Country-level data with regional-level stratification possible
• Core questionnaire (standard set of survey questions used in all locations)