Content validation of the Global Adolescent and Child Physical Activity Questionnaire (GAC-PAQ) in low-, middle-, and high-income countries across 6 continents

Participants' feedback was used to develop a revised, simplified, and culturally adapted GAC-PAQ, which will be pilot-tested in all 15 countries in an App that will include country-specific images and narration in local languages. Further research is needed to assess the reliability and validity of the revised GAC-PAQ.