From: The health Oriented pedagogical project (HOPP) - a controlled longitudinal school-based physical activity intervention program
Grades
1
2
3
4
5
6
Total
Population
457
484
462
461
496
2817
Sample
351
381
370
389
425
2297
Intervention schools
248
264
229
269
271
1545
Control schools
103
117
141
125
112
154
752