“…These authors compared 500 delinquent boys to a control group, matched on criteria of age, gender, IQ, ethnic and social background, and observed a higher proportion of middle-born children in their sample of delinquents (see, for similar results, Lee and Newson, 1954;Hirschi, 1969;West and Farrington, 1973;Leflore, 1988). These observations may be contrasted to discordant findings which either do not verify any effect of ordinal position (Ferguson, 1952;Johanson, 1968;Barry and Barry, 1969), or report inconsistent effects whereby later-borns would be more (Berg et al, 1967) or less (Biles, 1971;Koller, 1971) engaged in deviance. Such inconsistencies suggest that the effects of ordinal position on delinquency are modulated by factors that were not systematically controlled in previous research.…”