Mean number of sharing

Reciprocal sharing

condition

Non-reciprocal sharing condition

Between-group

Difference

Trial number

Trail 1

Trail 2

Trail 3

Trail 4

Trail 1

Trail 2

Trail 3

Trail 4

3-year-olds

0.82

1.03

1.00

1.06

0.83

0.80

0.80

0.70

3.48

4-year-olds

1.24

1.45

1.48

1.33

1.09

1.12

1.09

1.03

7.69**

5-year-olds

1.31

1.55

1.67

1.45

0.78

0.67

0.75

0.67

29.38***