The association of apolipoprotein E (apoE) polymorphism with temperament and Type A behavior was studied in 1577 randomly selected healthy children, adolescents, and young adults during a follow-up period of 9 years. Temperament was correlated with apoE phenotypes. Motor activity, even hyperactivity, in childhood and mental vitality in adolescence and young adulthood increased significantly with the apoE phenotypes in the order of E2/2, E3/2, E4/2, E3/3, E4/3, and E4/4. However, global Type A behavior was not associated with the order of apoE phenotypes. The findings suggest the importance of additional studies on genetic factor and temperament.
The authors examined characteristics of Finnish mothers (N = 924) who use hostile child-rearing practices (i.e., they ignore the child, are punitive and irritable, and perceive the child as a burden), practices that have been shown (Räikkönen & Keltikangas-Järvinen, 1992) to predispose children to Type A behavior. The results of this study indicate that two factors--Type A behavior in the mothers and the mothers' sociodemographic background (low occupational status, low educational level and young age)--increase the probability of the mothers' treating their children in a hostile manner. Also, the mothers of boys in this study reported more hostile child-rearing practices than the mothers of girls did.
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