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and only-children are more conscientious, more socially dominant, less agreeable, and less open to new ideas compared to later-borns. However, his conclusions have been challenged by other researchers, who argue that birth order effects are weak and inconsistent. In one of the largest studies conducted on the effect of birth order on the Big Five, data from a national sample of 9,664 subjects found no association between birth order and scores on the NEO PI-R personality test. Similarly, a large study (n = 8,689)

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