Kathleen Mullan Harris

The Mechanisms Mediating the Effects of Poverty on Children's Intellectual Development *

Although adverse consequences of poverty for children are documented widely, little is understood about the mechanisms through which the effects of poverty disadvantage young children. In this analysis we investigate multiple mechanisms through which poverty affects a child’s intellectual development. Using data from the NLSY and structural equation models, we have constructed five latent factors (cognitive stimulation, parenting style, physical environment, child’s ill health at birth, and ill health in childhood) and have allowed these factors, along with child care, to mediate the effects of poverty and other exogenous variables. We produce two main findings. First, the influence of family poverty on children’s intellectual development is mediated completely by the intervening mechanisms measured by our latent factors. Second, our analysis points to cognitive stimulation in the home, and (to a lesser extent) to parenting style, physical environment of the home, and poor child health at birth, as mediating factors that are affected by lack of income and that influence children’s intellectual development.

Acculturation and overweight-related behaviors among Hispanic immigrants to the US: The National Longitudinal Study of Adolescent Health

Little is known about the factors underlying the striking increase in overweight occurring between first and second generation US immigrants. Using data from the National Longitudinal Study of Adolescent Health, this study addressed two goals. First, we determined which measures of acculturation (defined as the acquisition of dominant cultural norms by members of a non-dominant group) were important. Second, we determined how the acculturation process affected differences in overweight and its proximate determinants (e.g., physical activity, diet, and smoking) as immigrants acculturated to American society. In addition, we sought to elucidate the role of underlying structural factors (e.g., family income and crime) and acculturation factors (e.g., language spoken at home and proportion of foreign-born neighbors) in generation differences in overweight. Results showed clear structural and acculturation differences between foreign and US-born immigrants to the US. Foreign-born immigrants were more likely to have lower family income and maternal education, and to live in areas of higher immigrant density and greater linguistic isolation. In addition, results suggested rapid acculturation of overweight-related behaviors, such as diet, smoking, and inactivity, in US-born relative to foreign-born immigrants. Multivariate analysis indicated that longer US residence was associated with increased overweight among Puerto Ricans and Cubans. Predicted probabilities showed that controlling for acculturation and proximate factors increased overweight among foreign-born adolescents, but had minimal impact for US-born adolescents. Thus, without the beneficial pattern of: acculturation factors, diet, and physical activity, first generation Hispanic adolescents would have higher overweight prevalence. We found important generation differences in structural, acculturation, and proximate overweight determinants. These lifestyle differences between foreign- and US-born Hispanic adolescent immigrants are likely to underlie the striking increase in overweight prevalence between first and subsequent generation of US residence.

Work and Welfare Among Single Mothers in Poverty

This article examines the relationship between work and welfare in poor, female-headed families by tracing the process through wich single mothers work their way off welfare. Analysis is based on montly data from the Panel Study of Income Dynamics (PSID) for the years 1984-86. The results reveal substantial labor market activity among single mothers on welfare not previously found in studies of welfare dynamics analyzing anual data. A majority of women work while they are on welfare, and more than two-thirds of welfare exist occur through work. Human capital investments are key determinants of welfare exits through work, while a large family size impedes particularly rapid job exits from welfare.

Paternal involvement with adolescents in intact families: The influence of fathers over the life course

We measure the quality and quantity of fathers’ involvement with adolescent children in intact families over time using longitudinal data from The National Survey of Children. We examine differentials in fathers’ involvement by children’s and family characteristics and model the long-term effects of fathers’ involvement on children’s outcomes in the transition to adulthood. Fathers are more involved with sons than with daughters and they disengage from adolescents with increasing marital conflict. We find beneficial effects for children of father’s involvement in three domains: educational and economic attainment, delinquent behavior, and psychological well-being. The course of affective relations throughout adolescence also has a beneficial effect on delinquent behavior and psychological well-being.

Making It in America: High School Completion by Immigrant and Native Youth

Using data from the National Longitudinal Study of Adolescent Health (Add Health), we find that first-generation youth of Hispanic, Asian, and African heritage obtain more education than their parents, but the second generation and third or higher generations lose ground. Differences in dropout rates by race-ethnicity and immigrant generation are driven by differences in human, cultural, and social capital. Low levels of family human capital, school social capital, and community social capital place the children of immigrants at risk of dropping out. However, cultural capital and immigrant optimism buffer first-generation Hispanic youth and the children of Asian immigrants from the risk of dropping out of high school. While human and social capital resources improve with immigrant generation, cultural capital diminishes.

What Are We Measuring? An Evaluation of the CES-D Across Race/Ethnicity and Immigrant Generation

The sociological study of the mental health of racial-ethnic minorities depends on the measurement quality of the instruments used to evaluate mental health. A commonly used instrument in research on mental health disparities, the Center for Epidemiologic Studies Depression Scale (CES-D), has not been thoroughly validated for use in the multiethnic and foreign-born populations currently living in the U.S. Using data from the National Longitudinal Study of Adolescent Health, this analysis provides the first multiethnic evaluation and psychometric analysis of the CES-D by acculturation level among youth ages 12–20. Correcting for the measurement problems contained in the CES-D improves the ability to detect differences in depression across ethnocultural groups, and to identify relationships between depression and other outcomes.

Sibling, peer, neighbor, and schoolmate correlations as indicators of the importance of context for adolescent development

We use nationally representative data to calculate correlations in achievement and delinquency between genetically differentiated siblings within a family, between peers as defined by adolescents’ “best friend” nominations, between schoolmates living in the same neighborhood, and between grademates within a school. We find the largest correlations between siblings, especially identical twins. Grademate and neighbor correlations are small. Peer-based correlations are considerably larger than grademate and neighbor correlations but not larger than most sibling correlations. The data suggest that family-based factors are several times more powerful than neighborhood and school contexts in affecting adolescents’ achievement and behavior.

The prevalence of trichomoniasis in young adults in the United States

Background and Objectives: The prevalence of trichomoniasis in the general population of the United States is unknown. This study provides the first population-based prevalence estimates of trichomoniasis among young adults in the United States. Methods: The National Longitudinal Study of Adolescent Health (Add Health) is an ongoing prospective cohort study. In a cross-sectional analysis of Wave III of Add Health (N = 12,449), we determined the prevalence of trichomoniasis using a polymerase chain reaction assay. Results: The estimated overall prevalence of trichomoniasis in U.S. young adults was 2.3% (95% confidence interval [CI], 1.8–2.7%). The prevalence was slightly higher among women (2.8%; 95% CI, 2.2–3.6%) than men (1.7%; 95% CI, 1.3–2.2%). The prevalence increased with age and varied by region, with the south having the highest prevalence (2.8%; 95% CI, 2.2–3.5%). The prevalence was highest among black women (10.5%; 95% CI, 8.3–13.3%) and lowest among white women (1.1%; 95% CI, 0.8–1.6%). Among men, the prevalence was highest among Native Americans (4.1%; 95% CI, 0.4–29.3%) and blacks (3.3%; 95% CI, 2.2–4.9%), and lowest among white men (1.3%; 95% CI, 0.9–1.8%). Conclusions: Trichomoniasis is moderately prevalent among the general U.S. population of young adults and disturbingly high among certain racial/ethnic groups.

Poverty, Paternal Involvement, and Adolescent Well-Being

In this article, we explore the role that parents play in family processes in poor and nonpoor two-parent families and the extent to which paternal participation varies across family income. Using longitudinal data from the National Survey of Children, we observe patterns of poverty over time in childhood and adolescence and examine whether father involvement buffers the effects of poverty on long-term outcomes of adolescents. We measure emotional and behavioral dimensions of parenting and contrast levels of father involvement with levels of mother involvement in their relations with adolescents across poverty experiences. Fathers in poor and welfare families are less involved with youth in adolescence and the greater the persistence of poverty, the less involvement by fathers. Although we document some buffering effects of fathers in poor families, mother involvement plays a more important role in protecting low-income youth from adverse outcomes.

I Wanna Hold Your Hand: The Progression of Social, Romantic and Sexual Events in Adolescent Relationships

CONTEXT Despite the vast amount of existing research on adolescent sexual behavior, little is known about the trajectory of social, romantic and sexual events within an adolescents relationship. METHODS A subsample of participants in Wave 2 of the National Longitudinal Study of Adolescent Health (8,438 respondents aged 12-21) provided data on the sequence of 15 social, romantic and sexual events that occurred in a recent romantic relationship. Proportions reporting each event and average relative rankings were assessed for all respondents, for different racial and ethnic groups, and for respondents who belonged to the same racial or ethnic group as their partner. Logistic regression was used to compare proportions; ordinary least square regression was used to analyze the mean sequential ranking of each event. RESULTS Social and romantic events, such as spending time with ones partner in a group and holding hands, were far more common than sexual events, such as touching ones partner without clothing, and typically preceded sexual events in the trajectory of relationship events. Romantic events were the most common across three of the four major U.S. racial and ethnic groups. Asian and Hispanic respondents tended to have low proportions reporting sexual events compared with white respondents. Black adolescents were the only group for whom talking about prevention of pregnancy and STDs preceded sexual events. Reports from male and female adolescents were similar. CONCLUSION Recognition of the diversity of relationship experiences may prompt the development of more effective interventions for adolescents who engage in risky sexual behavior.