Masterarbeit: Der Zusammenhang zwischen Geschwisterreihenfolge und Intelligenz: Eine Metaanalyse
Despite the long history of the interest in the relationship between child’s birth order and their intelligence, this topic was never investigated in a meta-analysis. Many studies report results in line with the “Confluence model” from Zajonc (1975) and the “Resource dilution model” from Blake (1981), i.e., a negative correlation between birth order (first born, second born, third born etc.) and intelligence score. Other articles suggest that this correlation is due to family size, which is theoretically described by the “Admixture hypotheses” by Page and Grandon (1979). The aim of this meta-analysis is now to comprehensively analyze these studies, regardless of where they took place and how the sample is composed. Furthermore, other potential moderators such as publication status and publication year are considered. In addition, the correlation between sibling order and intelligence which is controlled for family size is explored.