Trends and determinants of active school travel among Australian secondary school students: national cross-sectional data from 2009 to 2018.

Objective: To examine active school travel trends and predictors among Australian secondary school students (aged 12-17) between 2009 and 2018.

Methods: Three cross-sectional surveys (2009-10: N=13,790; 2012-13: N=10,309; and 2018: N=9,102) using a web-based self-report questionnaire. Logistic regression was used to identify differences in active travel (to and/or from school every weekday) between survey years and predictors.