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Jane Mendle K. Paige Harden Eric Turkheimer Carol A. Van Hulle Brian M. D'Onofrio Jeanne Brooks-Gunn Joseph L. Rodgers Robert E. Emery Benjamin B. Lahey 《Child development》2009,80(5):1463-1480
Children raised without a biological father in the household have earlier average ages of first sexual intercourse than children raised in father-present households. Competing theoretical perspectives have attributed this either to effects of father absence on socialization and physical maturation or to nonrandom selection of children predisposed for early sexual intercourse into father-absent households. Genetically informative analyses of the children of sister dyads ( N = 1,382, aged 14–21 years) support the selection hypothesis: This association seems attributable to confounded risks, most likely genetic in origin, which correlated both with likelihood of father absence and early sexual behavior. This holds implications for environmental theories of maturation and suggests that previous research may have inadvertently overestimated the role of family structure in reproductive maturation. 相似文献
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Quality of education and student earnings 总被引:2,自引:2,他引:0
When a university increases expenditures in an attempt to improve quality, a natural question for social policy is raised: is the improvement worth the cost? One partial measure of “worth” in this context is given by earnings of graduates: will those earnings rise by enough to pay a reasonable return on the investment in higher quality? The question is hard to answer by statistical means: universities of higher quality have better reputations which allow them to select students who are themselves of higher quality; so in trying to measure the relation between earnings and university quality, quality of the school may be confounded with quality of the students. Recently, however, several large data sets have been made available which give sufficient information on the students' own backgrounds, and on their later earning, that we can hope to disentangle the effect on earnings of the school from that of the student himself. This article summarizes the results of several such studies, including our own work. The verdict to date is that the relation between “quality”, however measured, and earnings is significant, and that expenditures to improve quality are worth the cost, even when “worth” is measured narrowly as higher earnings for graduates. 相似文献
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Nonmaternal care of infant children is increasingly common, but there is disagreement as to whether it is harmful for children. Using data from 9,185 children (5 years and older) who participated in the Children of the National Longitudinal Survey of Youth, the current study compared 2 groups: those for whom nonmaternal care was initiated in the first 3 years and those for whom it was not. Between-family comparisons showed that early nonmaternal care was associated with higher achievement and lower behavior problem scores in childhood and adolescence. However, within-family comparisons failed to detect differences between siblings who had different early nonmaternal care experiences. The study concludes that the timing of entry to nonmaternal care in the first 3 years has neither positive nor negative effects on children's outcomes. 相似文献
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OBJECTIVE: This study examines the association between maternal childhood maltreatment and psychopathology and aggression in intimate relationships during pregnancy and the postpartum period. METHOD: Forty-four pregnant women who were recruited from an obstetric clinic and local advertising periodical completed questionnaires about childhood maltreatment and psychopathology during their first trimester of pregnancy. Approximately 1 year after the birth of the child, 32 of the original participants completed these same questionnaires. Regression models were used to test the relationship between childhood maltreatment and psychopathology and aggression during pregnancy and 1 year postpartum. RESULTS: Sexual abuse and emotional neglect were related to psychopathology during pregnancy, and emotional neglect and physical abuse and neglect predicted poorer maternal outcomes 1 year postpartum. Contrary to expectations, physical abuse was related to less aggression during pregnancy, and emotional abuse was associated with less pathology postpartum. CONCLUSIONS: The results of this study indicate that childhood maltreatment is associated with poorer maternal mental health during pregnancy and 1 year postpartum and points to the need to improve targeting and treatment of psychopathology during this time. 相似文献
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Rodgers WM Wilson PM Hall CR Fraser SN Murray TC 《Research quarterly for exercise and sport》2008,79(2):222-234
This series of three studies considers the multidimensionality of exercise self-efficacy by examining the psychometric characteristics of an instrument designed to assess three behavioral subdomains: task, scheduling, and coping. In Study 1, exploratory factor analysis revealed the expected factor structure in a sample of 395 students. Confirmatory factor analysis (CFA) confirmed these results in a second sample of 282 students. In Study 2, the generalizability of the factor structure was confirmed with CFA in a randomly selected sample of 470 community adults, and discriminant validity was supported by theoretically consistent distinctions among exercisers and nonexercisers. In Study 3, change in self-efficacy in conjunction with adoption of novel exercise was examined in a sample of 58 women over 12 weeks. Observed changes in the three self-efficacy domains appeared to be relatively independent. Together, the three studies support a multidimensional conceptualization of exercise self-efficacy that can be assessed and appears to be sensitive to change in exercise behavior. 相似文献
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