Comprehension of Greek

Mother’s educational level

None to moderate

Very good/ Excellent

Primary to High school

2-year college/University/ Post-graduate studies

Mean (SD)

Mean (SD)

P

Effect

size

Mean (SD)

Mean (SD)

P

Effect

size

Ability to control Verbal and Physical Aggressiveness

5.5 (1.3)

5.9 (1.0)

0.008

0.39

5.8 (1.1)

5.9 (1.0)

0.069

0.09

Problem Solving

3.7 (1.1)

4.6 (1.1)

<0.001

0.74

4.6 (1.3)

5.1 (1.1)

<0.001

0.48

Concentration of Attention

4.3 (1.3)

5.0 (1.4)

<0.001

0.53

4.8 (1.5)

5.3 (1.4)

<0.001

0.30

Participation/Cooperation in class

4.7 (0.8)

5.3 (1.0)

<0.001

0.52

5.1 (1.1)

5.4 (1.0)

<0.001

0.23

Empathy

4.5 (1.0)

5.1 (1.1)

<0.001

0.53

5.1 (1.1)

5.2 (1.1)

0.021

0.11

Emotions’ Management

4.7 (1.0)

5.0 (1.1)

0.108

0.24

4.7 (1.2)

4.8 (1.3)

0.384

0.04

Friendship skills

4.4 (0.8)

5.1 (0.9)

<0.001

0.72

5.1 (1.0)

5.4 (0.9)

<0.001

0.32

Ability to control Victimization

5.7 (1.0)

6.0 (1.0)

0.050

0.29

6.0 (1.0)

6.2 (0.8)

<0.001

0.24

Emotions’ Identification and Expression

3.4 (1.0)

4.0 (1.1)

<0.001

0.55

4.3 (1.1)

4.6 (1.1)

<0.001

0.22

Use of Spoken and Written Language

2.8 (0.8)

4.2 (1.1)

<0.001

1.41

4.4 (1.2)

5.1 (1.1)

<0.001

0.56

Responsibility Taking

4.3 (1.0)

4.8 (1.1)

0.006

0.41

4.8 (1.1)

5.0 (1.1)

<0.001

0.21