Table 1 Descriptive statistics (means, standard deviations) for aggressive and prosocial behaviour of boys and girls at each wave of measurement by each informant

Teacher

Prosocial (7)

1.939

.836

2.412

.737

0

4.00

<.001

0.59

Prosocial (8)

2.033

.792

2.516

.777

0

4.00

<.001

0.62

Prosocial (9)

2.130

.835

2.673

.739

0

4.00

<.001

0.68

Prosocial (11)

1.956

.748

2.451

.750

0

4.00

<.001

0.65

Parent

Prosocial (7)

2.478

.543

2.670

.490

0.60

4.00

<.001

0.37

Prosocial (8)

2.598

.538

2.780

.498

1.00

4.00

<.001

0.35

Prosocial (9)

2.563

.528

2.774

.512

0.50

4.00

<.001

0.40

Prosocial (11)

2.587

.555

2.831

.529

0.80

4.00

<.001

0.42

Child

Prosocial (7)

.796

.185

.841

.156

0

1.00

<.001

0.28

Prosocial (8)

.864

.163

.908

.120

0

1.00

<.001

0.31

Prosocial (9)

.887

.157

.935

.108

0

1.00

<.001

0.35

Prosocial (11)

.860

.166

.928

.095

0

1.00

<.001

0.50

Teacher

Aggressive (7)

.721

.764

.448

.555

0

4.00

<.001

0.40

Aggressive (8)

.645

.682

.457

.571

0

3.45

<.001

0.30

Aggressive (9)

.678

.686

.452

.560

0

3.55

<.001

0.36

Aggressive (11)

.678

.774

.384

.535

0

3.75

<.001

0.44

Parent

Aggressive (7)

.669

.445

.539

.381

0

2.75

<.001

0.33

Aggressive (8)

.721

.457

.605

.415

0

2.58

<.001

0.27

Aggressive (9)

.701

.436

.595

.415

0

2.50

<.001

0.27

Aggressive (11)

.562

.380

.453

.340

0

2.41

<.001

0.30

Child

Aggressive (7)

.187

.176

.157

.170

0

1.00

.002

0.18

Aggressive (8)

.164

.179

.115

.140

0

0.92

<.001

0.30

Aggressive (9)

.152

.176

.100

.131

0

0.92

<.001

0.33

Aggressive (11)

.245

.212

.163

.164

0

0.92

<.001

0.43

Teacher

Peer difficulties (7)

1.758

.707

1.710

.715

1

5.00

ns

Peer difficulties (8)

1.646

.665

1.633

.651

1

4.67

ns

Peer difficulties (9)

1.737

.769

1.684

.708

1

5.00

ns

Peer difficulties (11)

1.830

.820

1.778

.777

1

5.00

ns