Preschools may reduce inequalities in early academic achievement by providing children from disadvantaged families with higher-quality learning environments than they would otherwise receive. In this study, longitudinal data from a nationally representative sample of more than 600 twin pairs were used to estimate the contributions of genes, the shared environment, and the nonshared environment to cognition and achievement scores in children enrolled versus not enrolled in preschool. Attending preschool at age 4 was associated with reductions in shared environmental influences on reading and math skills at age 5, but was not associated with the magnitude of shared environmental influences on cognition at age 2. These prospective effects were mediated by reductions in achievement gaps associated with minority status, socioeconomic status, and ratings of parental stimulation of cognitive development. Lower socioeconomic status was associated with lower rates of preschool enrollment, which suggests that the very children who would benefit most from preschools are the least likely to be enrolled in them.
AndreassenC.FletcherP. (2007). Early Childhood Longitudinal Study, Birth Cohort (ECLS–B) psychometric report for the 2-year data collection (NCES 2007–084). Washington, DC: U.S. Department of Education, National Center for Education Statistics, Institute of Education Sciences.
2.
BarnettW. S. (1995). Long-term effects of early childhood programs on cognitive and school outcomes. The Future of Children, 5, 25–50.
3.
BassokD. (2010). Do black and Hispanic children benefit more from preschool? Understanding differences in preschool effects across racial groups. Child Development, 81, 1828–1845.
4.
BayleyN. (1993). Bayley Scales of Infant Development (2nd ed.). San Antonio, TX: Psychological Corp.
5.
CampbellF. A.RameyC. T.PungelloE.SparlingJ.Miller-JohnsonS. M. (2002). Early childhood education: Young adult outcomes from the Abecedarian Project. Applied Developmental Science, 6, 42–57.
6.
CaughyM. O.DiPietroJ. A.StrobinoD. M. (1994). Day-care participation as a protective factor in the cognitive development of low-income children. Child Development, 65, 457–471.
7.
CurrieJ.ThomasD. (1995). Does Head Start make a difference?The American Economic Review, 85, 341–364.
8.
DearingE.McCartneyK.TaylorB. A. (2009). Does higher quality early child care promote low-income children’s math and reading achievement in middle childhood?Child Development, 80, 1329–1349.
9.
DowneyD. B.von HippelP. T.BrohB. A. (2004). Are schools the great equalizer? School and non-school sources of inequality in cognitive skills. American Sociological Review, 69, 613–635.
10.
DowsettC. J.HustonA. C.ImesA. E.GennetianL. (2008). Structural and process features in three types of child care for children from high and low income families. Early Childhood Research Quarterly, 23, 69–93.
11.
DuncanG. J.Brooks-GunnJ.KlebanovP. K. (1994). Economic deprivation and early childhood development. Child Development, 65, 296–318.
12.
DuncanG. J.DowsettC. J.ClaessensA.MagnusonK.HustonA. C.KlebanovP.JapelC. (2007). School readiness and later achievement. Developmental Psychology, 43, 1428–1446.
13.
DuncanG. J.LudwigJ.MagnussonK. A. (2007). Reducing poverty through preschool interventions. The Future of Children, 17, 143–160.
14.
Forget-DuboisN.PérusseD.TureckiG.GirardA.BilletteJ. M.RouleauG.TremblayR. E. (2003). Diagnosing zygosity in infant twins: Physical similarity, genotyping, and chorionicity. Twin Research and Human Genetics, 6, 479–485.
15.
GeoffroyM.-C.CôtéS. M.BorgeA. I.LaroucheF.SeguinJ. R.RutterM. (2007). Association between nonmaternal care in the first year of life and children’s receptive language skills prior to school entry: The moderating role of socioeconomic status. Journal of Child Psychology and Psychiatry, 48, 490–497.
16.
GeoffroyM.-C.CôtéS. M.GiguèreC.-É.DionneG.ZelazoP. D.TremblayR. E.SéguinJ. R. (2010). Closing the gap in academic readiness and achievement: The role of early childcare. Journal of Child Psychology and Psychiatry, 51, 1359–1367.
17.
GoldsmithH. H. (1991). A zygosity questionnaire for young twins: A research note. Behavior Genetics, 21, 257–269.
18.
GuoG.HarrisH. (2000). The mechanisms mediating the effects of poverty on children’s intellectual development. Demography, 37, 431–447.
19.
HeckmanJ. J. (2006). Skill formation and the economics of investing in disadvantaged children. Science, 312, 1900–1902.
20.
HustonA. C. (2004). Child care for low-income families: Problems and promises. In CrouterA. C.BoothA. (Eds.), Work-family challenges for low-income parents and their children (pp. 139–164). New York, NY: Erlbaum.
21.
HustonA. C.BentleyA. C. (2010). Human development in societal context. Annual Review of Psychology, 61, 411–437.
22.
LeakJ.DuncanG. J.LiW.MagnussonK.SchindlerH.YoshikawaH. (2010, November). Is timing everything? How early childhood education program impacts vary by starting age, program duration, and time since the end of the program. Paper presented at the meeting of the Association for Policy Analysis and Management, Boston, MA. Retrieved from http://www.gse.uci.edu/docs/Leak_Duncan_Li_Timing_Paper_APPAM_102810.pdf
23.
LoehlinJ. C.HardenK. P.TurkheimerE. (2009). The effects of assumptions about parental assortative mating and genotype-income correlation on estimates of genotype-environment interaction in the National Merit Twin Study. Behavior Genetics, 39, 165–169.
24.
Lugo-GilJ.Tamis-LeMondaC. S. (2008). Family resources and parenting quality: Links to children’s cognitive development across the first 3 years. Child Development, 79, 1065–1085.
25.
MagnusonK.MeyersM.RuhmC.WaldfogelJ. (2004). Inequality in preschool education and school readiness. American Educational Research Journal, 41, 115–157.
26.
MeyersM. K.RosenbaumD. T.RuhmC.WaldfogelJ. (2004). Inequality in early childhood education and care: What do we know? In NeckermanK. M. (Ed.), Social inequality (pp. 223–270). New York, NY: Sage.
27.
MuthénL. K.MuthénB. O. (2010). MPlus user’s guide (6th ed.). Los Angeles, CA: Muthén and Muthén.
28.
NajarianM.SnowK.LennonJ.KinseyS. (2010). Early Childhood Longitudinal Study, Birth Cohort (ECLS-B), preschool–kindergarten 2007 psychometric report (NCES 2010-009). Washington, DC: U.S. Department of Education, National Center for Education Statistics, Institute of Education Sciences.
29.
PriceT. S.FreemanB.CraigI. W.PetrillS. A.EbersoleL.PlominR. (2000). Infant zygosity can be assigned by parental report questionnaire data. Twin Research, 3, 129–133.
30.
PurcellS. (2002). Variance components models for gene-environment interaction in twin analysis. Twin Research, 5, 554–571.
31.
ScarrS.McCartneyK. (1983). How people make their own environments: A theory of genotype → environment effects. Child Development, 54, 424–435.
32.
SchultingA. B.MaloneP. S.DodgeK. A. (2005). The effects of school-based kindergarten transition policies and practices on child academic outcomes. Developmental Psychology, 41, 860–871.
33.
SchweinhartL. J.MontieJ.XiangZ.BarnettW. S.BelfieldC. R.NoresM. (2005). Lifetime effects: The High/Scope Perry Preschool Study through age 40. Ypsilanti, MI: High/Scope Press.
34.
SnowK.DerechoA.WheelessS.LennonJ.RosenJ.RogersJ.EinaudiP. (2009). Early Childhood Longitudinal Study, Birth Cohort (ECLS-B), kindergarten 2006 and 2007 data file user’s manual (2010-010). Washington, DC: U.S. Department of Education, National Center for Education Statistics, Institute of Education Sciences.
35.
Tucker-DrobE. M. (2011). Individual differences methods for randomized experiments. Psychological Methods, 16, 298–318.
36.
Tucker-DrobE. M.RhemtullaM.HardenK. P.TurkheimerE.FaskD. (2011). Emergence of a Gene × Socioeconomic Status interaction on infant mental ability between 10 months and 2 years. Psychological Science, 22, 125–133.
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