School

F-value

Grade

Mean (S.D.)

#2

[F(2, 295) = 37.43, p < 0.001]

4^th

26.64 (4.45)

5^th

27.05 (4.19)

6^th

31.46 (4.52)

#3

[F(2, 191) = 7.76, p < 0.01]

4^th

24.52 (3.49)

5^th

25.34 (4.60)

6^th

27.37 (4.64)

#4

[F(2, 146) = 5.26, p < 0.01]

4^th

25.23 (3.01)

5^th

27.35 (3.58)

6^th

26.65 (3.98)

#5

[F(2, 744) = 48.98, p < 0.01]

4^th

24.48 (3.55)

5^th

25.54 (4.45)

6^th

28.24 (4.83)

#6

[F(2, 414) = 9.61, p < 0.001]

4^th

5^th

6^th

27.52 (4.67)

26.98 (4.43)

29.52 (5.75)