The associations of birth order with personality and intelligence in a representative sample of U.S. high school students |
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| Institution: | 1. School of Medicine and Dentistry, Griffith University, Gold Coast, Australia;2. National Dental Research Institute Singapore, National Dental Centre Singapore, Oral Health ACP, Health Services and Systems Research Programme, Duke-NUS Medical School, Singapore;3. National Dental Centre, ACP Research Office, Duke-NUS Medical School, Centre for Quantitative Medicine, Singapore;4. School of Medicine and Dentistry, Griffith University, Gold Coast, Griffith Health Centre (G40), Office 7.59, QLD 4222, Australia |
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| Abstract: | We tested birth order associations with personality traits and intelligence using Project Talent, a representative sample (N = 377,000) of U.S. high school students. Using a between-family design and several background factors (i.e., age, sex, sibship size, parental socio-economic status, and family structure), we were able to control for potential confounds, and estimate the links between birth order and outcomes across several different social categories. In addition to differences between firstborns and laterborns across the entire sample, we also tested birth rank trends in a sub-sample of targets from sibships of three, raised by two parents. Overall, the average absolute association between birth order and personality traits was .02, whereas the one between birth order and intelligence was .04. |
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| Keywords: | Birth order Personality Project Talent Intelligence Family background |
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