Middle children are more cooperative than their siblings, study suggests

In one of the largest studies ever conducted on birth order, Canadian researchers gathered data from more than 700,000 volunteers and found that on average, middle children scored higher than their siblings on traits seen as important for cooperation.

The effects are not large, but Michael Ashton and Kibeom Lee believe they challenge the idea that birth order and the number of children raised together have no meaningful impact on personality.

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