Table 2 Means and standard deviations (SD) of the Strengths and Difficulties Questionnaire (SDQ) scales

Prosocial behaviour^a

8.1 ± 1.8

7.9 ± 2.0

8.4 ± 1.6

7.5 ± 2.1

8.2 ± 1.8

Hyperactivity^b

3.6 ± 2.2

3.1 ± 2.2

3.1 ± 2.1

3.9 ± 2.2

4.1 ± 2.2

Emotional symptoms^abc

3.0 ± 2.1

2.3 ± 2.2

3.1 ± 2.0

2.5 ± 2.0

3.7 ± 2.1

Conduct problems^b

2.0 ± 1.5

3.0 ± 1.7

2.8 ± 1.4

3.0 ± 1.5

3.1 ± 1.5

Peer problems

1.8 ± 1.7

1.9 ± 2.0

1.7 ± 1.6

1.9 ± 1.8

2.0 ± 1.6