ABSTRACT
Hierarchical linear modeling was used to model the dynamics of family income-to-needs for participants of the National Institute of Child Health and Human Development Study of Early Child Care (N = 1,364) from the time that children were 1 through 36 months of age. Associations between change in income-to-needs and 36-month child outcomes (i.e., school readiness, receptive language, expressive language, positive social behavior, and behavior problems) were examined. Although change in income-to-needs proved to be of little importance for children from nonpoor families, it proved to be of great importance for children from poor families. For children in poverty, decreases in income-to-needs were associated with worse outcomes and increases were associated with better outcomes. In fact, when children from poor families experienced increases in income-to-needs that were at least 1 SD above the mean change for poor families, they displayed outcomes similar to their nonpoor peers. The practical importance and policy implications of these findings are discussed.
Subject(s)
Child Development , Child Behavior Disorders/psychology , Child Language , Child, Preschool , Cognition , Female , Humans , Infant , Infant, Newborn , Male , Social Behavior , Socioeconomic FactorsABSTRACT
Real decisions for real children are influenced by the papers developmentalists write, regardless of whether we ever intended our papers to be used in the policy arena. Yet most social scientists seldom analyze data in ways that are most useful to policymakers. The primary purpose of this paper is to share three ideas concerning how to evaluate the practical importance of a finding or set of findings. First, for research to be most useful not only in the policy arena but also more generally, significance tests need to be accompanied by effect size estimates. The practical importance of an effect size depends on the scientific context (i.e., measurement, design, and method) as well as the empirical literature context. Second, researchers need to use all existing data when weighing in on a policy debate; here, meta-analyses are particularly useful. Finally, researchers need to be careful about embracing null or small findings, because effects may well be small due to measurement problems alone, particularly early in the history of a research domain.
Subject(s)
Child Development , Public Policy , Child , Child, Preschool , Humans , Policy MakingABSTRACT
Data from the National Institute of Child Health and Human Development Study of Early Child Care were analyzed to explore effects of marital separation on children in the first 3 years of life. The sample included 73 never-married mothers and 97 separated mothers; a comparison group of 170 was conditionally randomly selected from the 2-parent families. Children in 2-parent families performed better than children in 1-parent families on assessments of cognitive and social abilities, problem behavior, attachment security, and behavior with mother. However, controlling for mothers' education and family income reduced these differences, and associations with separated-intact marital status were nonsignificant (the effect size was .01). Thus, children's psychological development was not affected by parental separation per se; it was related to mothers' income, education, ethnicity, child-rearing beliefs, depressive symptoms, and behavior.
Subject(s)
Divorce/psychology , Intelligence , Parenting/psychology , Personality Development , Social Adjustment , Adult , Child, Preschool , Female , Humans , Infant , Male , Single Parent/psychology , Socioeconomic FactorsSubject(s)
Child Care/standards , Child Day Care Centers/organization & administration , Family , Nurseries, Infant/organization & administration , Parental Leave , Public Policy , Child , Child, Preschool , Europe , Female , Financing, Personal , Humans , Income Tax , Infant , Male , United States , Women, WorkingABSTRACT
Developmental change in twin similarity was examined with age contrasts in a meta-analysis of twin studies from 1967 through 1985. Intraclass rs were coded from 103 papers that included data for monozygotic or dizygotic twins, or for both, on personality or intelligence variables. Analyses indicated that there was a general tendency for some intraclass rs to decrease with age. In other words, as twins grow up, they grow apart. There were also developmental differences associated with components of variance for heritability, the shared environment, and the nonshared environment. Mechanisms through which the nonshared environment may operate are discussed.
Subject(s)
Individuation , Personality Development , Social Environment , Twins/psychology , Adolescent , Adult , Child , Humans , Meta-Analysis as TopicSubject(s)
Child Care , Mothers , Women, Working , Child, Preschool , Female , Humans , Research DesignABSTRACT
We propose a theory of development in which experience is directed by genotypes. Genotypic differences are proposed to affect phenotypic differences, both directly and through experience, via 3 kinds of genotype leads to environment effects: a passive kind, through environments provided by biologically related parents; an evocative kind, through responses elicited by individuals from others; and an active kind, through the selection of different environments by different people. The theory adapts the 3 kinds of genotype-environment correlations proposed by Plomin, DeFries, and Loehlin in a developmental model that is used to explain results from studies of deprivation, intervention, twins, and families.