@DegenRolf I don't buy it. Small sample, no controls for family size. Cf. https://www.researchgate.net/publication/279460901_The_Associations_of_Birth_Order_with_Personality_and_Intelligence_in_a_Representative_Sample_of_US_High_School_Students …
Birth order impacts prosociality, with later birth orders exhibiting greater prosociality. But only self-reports! http://www.sciencedirect.com/science/article/pii/S0191886916301210 …
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