Variable

6th grade

7th grade

8th grade

9th grade

10th grade

11th grade

12th grade

AET

Mean

4.40

5.19

6.04

7.49

8.86

10.27

12.24

SD

1.50

1.33

1.88

2.89

3.02

3.05

2.92

RMT

Mean

2.80

4.05

4.59

4.64

4.70

5.69

6.30

SD

1.83

1.85

1.56

1.86

1.55

2.03

1.60

AAME

Mean

28.51

34.05

33.90

43.02

45.76

52.00

56.21

SD

10.60

12.45

9.08

12.02

9.41

8.83

7.98

CTIF

Mean

10.90

13.66

14.61

16.26

16.11

17.82

18.98

SD

3.60

3.26

3.25

2.84

3.26

3.30

3.05