7th grade

(190 days)

8th grade

(152 days)

9th grade

(171 days)

All

(513 days)

All

Post-hoc

Mean

(SD)

Mean

(SD)

Mean

(SD)

Mean

(SD)

ANOVA p-value

7-8th grade

7-9th grade

8-9th grade

Light PA (1.5 - 2.9 MET)

3:28

(0:32)

2:54

(0:36)

2:58

(0:42)

3:08

(0:40)

0.000

0.000

0.000

0.834

Moderate PA (3 - 6 MET)

0:59

(0:16)

1:05

(0:23)

1:03

(0:21)

1:02

(0:20)

0.016

0.016

0.193

0.656

Vigorous PA (over 6 MET)

0:08

(0:07)

0:09

(0:06)

0:08

(0:06)

0:08

(0:06)

0.110

0.317

0.937

0.098

MVPA

1:08

(0:40)

1:15

(0:43)

1:11

(0:40)

1:11

(0:41)

0.283

0.315

0.864

0.755

Time spent standing

2:36

(0:47)

2:38

(1:02)

2:50

(0:57)

2:41

(0:55)

0.041

0.915

0.030

0.287

Time spent sitting

6:30

(1:05)

6:31

(1:07)

6:25

(1:04)

6:29

(1:05)

0.667

10.000

0.782

0.864

Time spent lying

1:19

(1:13)

0:41

(0:35)

1:20

(1:08)

1:08

(1:05)

0.000

0.000

10.000

0.000

Total sedentary

(sitting and lying)

7:51

(2:01)

7:11

(1:18)

7:45

(2:02)

7:37

(1:52)

0.003

0.001

0.970

0.008