Balanced

Self-selected

M

SD

M

SD

F-value

η2

During the first week

Friendship relations within group

1.63

1.32

3.00

1.45

36.880^**

0.20

Friendship relations outside group

8.57

5.26

9.54

5.00

1.349

0.01

E-I friendship relations

0.66

0.32

0.48

0.27

13.496^**

0.08

Same GLOBE relations within group

2.40

2.08

2.89

1.90

2.258

0.02

Different GLOBE relations within group

4.77

2.30

2.09

1.88

60.322^**

0.29

E-I GLOBE relations within group

0.32

0.61

−0.14

0.76

16.898^**

0.10

After 11 weeks

Learning relations within group

2.72

1.98

2.49

1.35

0.678

0.01

Learning relations outside group

3.58

3.64

5.23

3.86

7.294^**

0.05

E-I index learning relations

0.01

0.54

0.29

0.36

13.781^**

0.08