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| 7th grade (n = 190) | 8th grade (n = 152) | 9th grade (n = 171) | All (n = 513) | ANOVA | Post-hoc |
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| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | p value | 7 - 8th grade | 7 - 9th grade | 8 - 9th grade |
| Total steps | 8054 (2156) | 9036 (2618) | 8625 (2421) | 8535 (2418) | 0.001 | 0.001 | 0.057 | 0.369 |
| Running steps | 843 (624) | 796 (529) | 547 (417) | 730 (549) | 0.000 | 0.856 | 0.000 | 0.000 |