THE study of birth order (or sibship position) and its behavioural correlates has been one of the early interests of psychology. While the theoretical discussion of the meaning and effects of birth order is traced to Adler (1928), there were earlier studies of this topic, particularly in relation to eugenics {e.g. Pearson, 1914). More recently, Schachter has refocused attention on the significance of this factor with reference to affiliation. The present paper will examine the relationship between birth order and one type of behaviour, delinquency and criminality. The first investigation of this topic was a study by Breckenridge and Abott (1912) of 584 boys who were processed at the Cook County juvenile court during the period 1903-1904. This study revealed that first-born children were over-represented by 16 per cent, among the court cases, and middle-born by 9 per cent., while last-born were considerably underrepresented. Another early exploration of this problem is Goring's (1913) study of 3,000 English prisoners. With the help of Karl Pearson, Goring established that his subjects included substantially more first-born than expected. Despite the controversial method of calculating the expected frequency in each sibship position (Greenwood and Yule, 1914), Pearson (1914) indicated that, regardless of the method, first-born were indeed overrepresented in Goring's sample. Pearson neglected to notice that the overrepresentation of the second-born was even greater. Several studies in the late 1920s and the early 1930s dealt with the relationship of birth order and delinquency and generally confirmed the prior findings of over-representation of first-born children. Levy (1931) studied 700 cases from the files of the Institute of Juvenile Research in Chicago, of which 296 were delinquents. He concluded that the only child commits more acts of delinquency than children with one brother or sister . Wile and Noetzel (1931) stated that delinquents tend to be the eldest children. In both studies, subjects were compared with estimates of the relevant data, drawn from different samples. Armstrong (1933) wrote that it is only in offenses against the home {i.e. desertion and ungovernability) that there is reliability of primogeniture of delinquents . A different interpretation of her data would be that delinquents tend to be first-born in sibships of two to five, while in most of the larger sibships, intermediate positions dominate. Parsley (1933) presented more adequate data in her study of delinquent girls in Chicago. In this study one may compare the research group with controls while holding the sibship size constant. These data show that, while simple analysis seems to indicate predominance of first-born, controlling for sibship size shows the middle positions as over-represented (with the small exception of sibships of eight or more). Fortes' study (1933)
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