Craig T. Ramey

Early Childhood Education: Young Adult Outcomes From the Abecedarian Project

The high-risk infants who initially enrolled in the Abecedarian Project, a longitudinal prospective study of the benefits of early childhood educational intervention within a child care setting, were followed up as young adults (age 21 years). One hundred-eleven infants were in the original sample; 104 took part in the follow up. Treatment was provided in 2 phases: during preschool and in the primary grades. Participants received either both phases, 1, but not both, or neither. Assignment to groups was random. Those in the preschool treatment group earned significantly higher scores on intellectual and academic measures as young adults, attained significantly more years of total education, were more likely to attend a 4-year college, and showed a reduction in teenaged pregnancy compared with preschool controls. Preschool treatment was associated with educationally meaningful effect sizes on reading and math skills that persisted into adulthood. School-age treatment served to maintain preschool benefits for reading, but by itself, the effects were generally weaker than those of the preschool program. Statistically significant differences in the attainment of full economic independence were not found at this stage, but would not be expected among young adults still attending school. The incidence of self-reported violence and lawbreaking was not significantly reduced, although trends in the data favored the treated group. The reported incidence of marijuana use was significantly less among treated individuals. The positive findings with respect to academic skills and increased years of post-secondary education support policies favoring early childhood programs for poor children.

Home environment and cognitive development in the first 3 years of life: A collaborative study involving six sites and three ethnic groups in North America.

Attempted to examine the generalizability of environment/development relationships among 3 ethnic groups across the first 3 years of life. Social status did not show a consistent relationship to either quality of home environment or childrens developmental status across the various groups. Results indicated a fairly consistent relationship between HOME scores and childrens developmental status, although there were some ethnic and social status differences in the relationship. Measures of specific aspects of the childs home environment, such as parental responsivity and availability of stimulating play materials, were more strongly related to child developmental status than global measures of environmental quality such as SES. When the childs early developmental status and early home environment were both very low, the likelihood of poor developmental outcomes was markedly increased compared with cases when only one was low.

The development of cognitive and academic abilities: Growth curves from an early childhood educational experiment.

In the Abecedarian Project, a prospective randomized trial, the effects of early educational intervention on patterns of cognitive and academic development among poor, minority children were examined. Participants in the follow-up were 104 of the original 111 participants in the study (98% African American). Early treatment was full-time, high-quality, educational child care from infancy to age 5. Cognitive test scores collected between the ages of 3 and 21 years and academic test scores from 8 to 21 years were analyzed. Treated children, on average, attained higher scores on both cognitive and academic tests, with moderate to large treatment effect sizes observed through age 21. Preschool cognitive gains accounted for a substantial portion of treatment differences in the development of reading and math skills. Intensive early childhood education can have long-lasting effects on cognitive and academic development.

Cognitive and School Outcomes for High-Risk African-American Students at Middle Adolescence: Positive Effects of Early Intervention

Long-term intellectual and academic benefits related to early childhood educational intervention were found in a sample of students from low-income families (98% African American). The subjects were randomly assigned to preschool and school-age treatment conditions in a study design that permits a comparison of outcomes in students with preschool treatment followed by early elementary treatment (infancy–8 years), preschool treatment only (infancy–5 years), early elementary school treatment only (5 years–8 years), and untreated controls. At age 15, seven to ten years after any treatment was provided, those students who had preschool treatment scored significantly higher on individually administered tests of reading and mathematics and had fewer instances of grade retention and assignments to special education. The results support the relative efficacy of preschool treatment over that given in early elementary school. Policy implications stress the importance of providing high quality early childhood environments for impoverished children.

Early Learning and School Readiness: Can Early Intervention Make a Difference?

Childrens experiences prior to kindergarten entry are correlated with degree of cognitive development and school readiness as measured by standardized assessments of cognitive and linguistic performance. Children from economically poor and undereducated families are at elevated risk for lack of school readiness due to less knowledge and skill. This article reviews evidence from randomized controlled trials (RCTs) that were designed to test the hypothesis that preschool education, with an emphasis on seven particular classes of experiences, could be efficacious in improving readiness for school and subsequent academic achievement in reading and mathematics. Results indicate that the cumulative developmental toll that is measured reliably in high-risk samples of children beginning in the second year of life can be substantially reduced through a high-quality preschool program. This positive effect has been replicated in nine additional trials using RCT methodology. Additionally, long-term follow-up of the original study participants indicates not only improved performance in reading and mathematics in elementary and secondary school but also a reduction in special education placement and grade retention, among other practical benefits. Results are discussed with respect to public policy recommendations and suggestions for future research.

Persistent Effects of Early Childhood Education on High-Risk Children and Their Mothers

Child and mother outcomes are reported for the Abecedarian Project, an early childhood education, pediatric healthcare, and family support program for high-risk children and their mothers. Three randomized intervention conditions for at-risk participants were compared to a control condition. Randomized control group participants received family support social services, low-cost or free pediatric care, and child nutritional supplements but no additional educational program beyond what the parents and the local school system provided. The local community was generally affluent and well educated; disadvantaged families represented a small minority whose welfare was a high social and educational priority. The educational intervention conditions were (a) preschool education for the first 5 years of life plus a supplementary kindergarten through 2nd grade Educational Support Program (Preschool plus K-2 Support), (b) preschool education (Preschool Only), and (c) K-2 Educational Support Program (K-2 Only). Child outcomes were assessed with respect to cognitive development, academic achievement, grade retention, and special education placements. For mothers, the effect of having educational childcare during the preschool period was examined with respect to maternal educational gains and employment. Positive and systematic cognitive and academic achievement differences were found for children in the preschool treatment conditions, particularly when that condition was combined with the K-2 Educational Support Program. High-quality, consistently available preschool education was also associated with greater maternal educational advancement and higher levels of employment particularly for teenage mothers. These findings have direct relevance for education and welfare policies.

Early Intervention and Mediating Processes in Cognitive Performance of Children of Low-Income African American Families

This longitudinal study of 161 African American children from low-income families examined multiple influences, including early childhood interventions and characteristics of the child and family, on longitudinal patterns of childrens cognitive performance measured between 6 months and 8 years of age. Results indicate that more optimal patterns of cognitive development were associated with intensive early educational child care, responsive stimulating care at home, and higher maternal IQ. In accordance with a general systems model, analyses also suggested that child care experiences were related to better cognitive performance in part through enhancing the infants responsiveness to his or her environment. Maternal IQ had both a direct effect on cognitive performance during early childhood and, also, an indirect effect through its influence on the family environment.

Power calculations for general linear multivariate models including repeated measures applications

Recently developed methods for power analysis expand the options available for study design. We demonstrate how easily the methods can be applied by (1) reviewing their formulation and (2) describing their application in the preparation of a particular grant proposal. The focus is a complex but ubiquitous setting: repeated measures in a longitudinal study. Describing the development of the research proposal allows demonstrating the steps needed to conduct an effective power analysis. Discussion of the example also highlights issues that typically must be considered in designing a study. First, we discuss the motivation for using detailed power calculations, focusing on multivariate methods in particular. Second, we survey available methods for the general linear multivariate model (GLMM) with Gaussian errors and recommend those based on F approximations. The treatment includes coverage of the multivariate and univariate approaches to repeated measures, MANOVA, ANOVA, multivariate regression, and univariate regression. Third, we describe the design of the power analysis for the example, a longitudinal study of a childs intellectual performance as a function of mothers estimated verbal intelligence. Fourth, we present the results of the power calculations. Fifth, we evaluate the tradeoffs in using reduced designs and tests to simplify power calculations. Finally, we discuss the benefits and costs of power analysis in the practice of statistics. We make three recommendations: Align the design and hypothesis of the power analysis with the planned data analysis, as best as practical.Embed any power analysis in a defensible sensitivity analysis.Have the extent of the power analysis reflect the ethical, scientific, and monetary costs. We conclude that power analysis catalyzes the interaction of statisticians and subject matter specialists. Using the recent advances for power analysis in linear models can further invigorate the interaction.

Adult Outcomes as a Function of an Early Childhood Educational Program: An Abecedarian Project Follow-Up

Adult (age 30) educational, economic, and social-emotional adjustment outcomes were investigated for participants in the Abecedarian Project, a randomized controlled trial of early childhood education for children from low-income families. Of the original 111 infants enrolled (98% African American), 101 took part in the age 30 follow-up. Primary indicators of educational level, economic status, and social adjustment were examined as a function of early childhood treatment. Treated individuals attained significantly more years of education, but income-to-needs ratios and criminal involvement did not vary significantly as a function of early treatment. A number of other indicators were described for each domain. Overall, the findings provide strong evidence for educational benefits, mixed evidence for economic benefits, and little evidence for treatment-related social adjustment outcomes. Implications for public policy are discussed.

Predicting IQ from mother–infant interactions.

Longitudinal observations of maternal and infant characteristics were used to investigate the consequences of early day-care intervention for infants at high risk for intellectual retardation due to sociocultural factors. High-risk infants and their mothers were compared on social and intellectual characteristics with a control group not enrolled in an intervention program and with a random sample of mother-child dyads from the general population. Results from group comparisons indicated that mothers of high-risk infants in a day-care intervention group interacted with their infants in ways quite similar to mother of high-risk infants who were not enrolled in the intervention program. Both high-risk groups differed from the general population of mothers on interaction and attitudinal measures. Changes across time on the measures taken were roughly parallel from all three groups. Multiple regression analyses using maternal variables and mother-infant interactional variables to predict 36-month Stanford-Binet scores for the high-risk samples indicated that childrens intelligence was predictable from previous maternal behaviors and attitudes, particularly for the control group, and that early day-care intervention apparently had altered the predictiveness of some maternal factors.