Fig. 4From: Examining the impact of a province-wide physical education policy on secondary students’ physical activity as a natural experimentResults from Study 2 (accelerometer): Student MVPA trajectories from April 2008 to January 2012, by study condition. Linear regressions of MVPA (minutes per day) across semesters for each student with baseline and at least 1 valid follow-up measurement, by study condition, are shown in gray. Linear growth curves showing averaged baseline MVPA and averaged rate of change in MVPA among students, by study condition, are shown in black Back to article page