From: The longitudinal association between objectively-measured school-day physical activity and academic achievement in US elementary school students
School Randomization Status
Semester
Intervention
Control
p-value
Mean (SD)
Grade 4 Fall (T1)
22.6 (9.5)
19.6 (8.5)
<  0.001
Grade 4 Spring (T2)
24.1 (10.4)
19.6 (9.1)
< 0.001
Grade 5 Fall (T3)
21.5 (9.0)
16.3 (8.0)