First measurement-point (kindergarten)

Second measurement-point (first grade)

Total

Girls

Boys

Total

Girls

Boys

M

(SD)

M

(SD)

M

(SD)

M

(SD)

M

(SD)

M

(SD)

Academic self-concept

Mathematical

18.34

(6.25)

18.50

(6.94)

18.19

(5.65)

19.25

(4.74)

18.34

(5.05)

20.12

(4.35)

Literacy

16.33

(6.60)

17.12

(6.47)

15.66

(6.67)

20.01

(4.34)

20.25

(4.17)

19.81

(4.50)

Social self-concept

Peer-related

20.31

(4.90)

20.87

(5.21)

19.84

(4.61)

19.51

(4.75)

19.03

(5.14)

19.90

(4.38)

Teacher-related

20.68

(5.15)

21.66

(4.79)

19.85

(5.33)

20.60

(4.38)

21.02

(4.23)

20.25

(4.50)