We Learn Together is a 20-week, low-cost infant/toddler school-readiness intervention developed to provide instructional content and supportive tools for teachers to be more explicit and intentional in interactions with children to support early development. Short-term effects were established in a previously published real-world effectiveness randomized controlled trial. In the present quasi-experimental study, we examined the extent to which the effects remained approximately 1 year after the intervention. Because the original control group eventually also got the intervention, we compared mandatory municipal language assessment outcomes of 2,327 children in the treatment group to matched nontreatment children. The intervention effect was maintained at similar magnitudes at the 1-year follow-up for oral language skills (effect sizes = 0.09–0.14), and spillover effects were found for rhyming skills (effect size = 0.12).
AckermanD. (2021). Reviewing the research base from 1985–2020: Infant and toddler child care and at-risk children’s school readiness. Infant and Toddler Policy Research Center at NIEER.
2.
BlesesD.HøjenA.DaleP.JusticeL.DybdalL.PiastaS.Markussen-BrownJ.HaghishE. F.KjærbækL. (2018). Scaling-up effective language and literacy instruction: Evaluating the importance of scripting and group size components. Early Childhood Research Quarterly, 42, 256–269. https://doi.org/10.1016/j.ecresq.2017.10.002
3.
BlesesD.JensenP.HøjenA.SlotP.JusticeL. (2021). Implementing toddler interventions at scale: The case of “We Learn Together.”Early Childhood Research Quarterly, 57, 12–26. https://doi.org/10.1016/j.ecresq.2021.04.008
4.
BlesesD.JensenP.HøjenA.WillemsenM. M.SlotP.JusticeL. M. (2024). Examining the effects of an infant-toddler school readiness intervention in center-and family-based programs: Are results generalizable?Early Childhood Research Quarterly, 67, 252–264. https://doi.org/10.1016/j.ecresq.2024.01.001
5.
BlesesD.JensenP.SlotP.JusticeL. (2020). Low-cost teacher-implemented intervention improves toddlers’ language and math skills. Early Childhood Research Quarterly, 53, 64–76. https://doi.org/10.1016/j.ecresq.2020.03.001
6.
BlesesD.VachW.JørgensenR. N.WormT. (2010). The internal validity and acceptability of the Danish SI-3: A language screening instrument for 3-year-olds. Journal of Speech, Language and Hearing Research, 53, 490–507. https://doi.org/10.1044/1092–4388(2009/08–0132)
7.
BlinkoffE.NesbittK. T.GolinkoffR. M.Hirsh-PasekK. (2023). Investigating the contributions of active, playful learning to student interest and educational outcomes. Acta Psychologica, 238, Article 103983. https://doi.org/10.1016/j.actpsy.2023.103983
8.
BornsteinM. H.HahnC.-S.PutnickD. L. (2016). Long-term stability of core language skill in children with contrasting language skills. Developmental Psychology, 52, 704–716. https://doi.org/10.1037/dev0000111
9.
BroströmS.JohanssonI.SandbergA.FrøkjærT. (2014). Preschool teachers’ view on learning in preschool in Sweden and Denmark. European Early Childhood Education Research Journal, 22, 590–603. https://doi.org/10.1080/1350293X.2012.746199
BurchinalM.MagnusonK.PowellD.HongS. S. (2015). Early childcare and education. In BornsteinM. H.LeventhalT.LernerR. M. (Eds.), Handbook of child psychology and developmental science: Ecological settings and processes (pp. 223–267). John Wiley & Sons, Inc.
ChambersB.CheungA. C.SlavinR. E. (2016). Literacy and language outcomes of comprehensive and developmental-constructivist approaches to early childhood education: A systematic review. Educational Research Review, 18, 88–111. https://doi.org/10.1016/j.edurev.2016.03.003
DuncanG.KalilA.MogstadM.RegeM. (2023). Investing in early childhood development in preschool and at home. In HanushekE. A.MachinS.WoessmannL. (Eds), Handbook of the economics of education (Vol. 6, pp. 1–91). Elsevier.
16.
DuncanG. J.DowsettC. J.ClaessensA.MagnusonK.HustonA. C.KlebanovP.PaganiL. S.FeinsteinL.EngelM.Brooks-GunnJ. (2007). School readiness and later achievement. Developmental Psychology, 43, 1428–1446. https://doi.org/10.1037/0012–1649.43.6.1428
17.
DunnL. M.DunnD. M. (2007). Peabody picture vocabulary test (PPVT-4). Pearson Assessments.
18.
EadieP.BavinE. L.BrethertonL.CookF.GoldL.MensahF.WakeM.ReillyS. (2021). Predictors in infancy for language and academic outcomes at 11 years. Pediatrics, 147, Article e20201712. https://doi.org/10.1542/peds.2020–.1712
19.
FensonL.MarchmanV.ThalD. J.DaleP. S.ReznickJ. S.BatesE. (2007). MacArthur-Bates communicative development inventories. User’s guide and technical manual (2nd ed.). Paul H. Brookes Publishing Co.
20.
FoxS. E.LevittP.NelsonC. A.III. (2010). How the timing and quality of early experiences influence the development of brain architecture. Child Development, 81, 28–40. https://doi.org/10.1111/j.1467–8624.2009.01380.x
21.
GreenwoodC. R.SchnitzA. G.CartaJ. J.WallischA.IrvinD. W. (2020). A systematic review of language intervention research with low-income families: A word gap prevention perspective. Early Childhood Research Quarterly, 50, 230–245. https://doi.org/10.1016/j.ecresq.2019.04.001
22.
HadleyE.BarnesE.WiernikB.RaghavanM. (2022). A meta-analysis of teacher language practices in early childhood classrooms. Early Childhood Research Quarterly, 59, 186–202. https://doi.org/10.1016/j.actpsy.2023.103983
23.
HadleyE. B.BarnesE. M.HwangH. (2023). Purposes, places, and participants: A systematic review of teacher language practices and child oral language outcomes in early childhood classrooms. Early Education and Development, 34(4), 862–884.
24.
HaghishE. F.VachW.HøjenA.BlesesD. (2021). Estimating measurement error: Evaluating daycare educators as assessors of outcome measures in large scale intervention studies. PLoS ONE, 16, Article e0255414. https://doi.org/10.1371/journal.pone.0304884
25.
HainmuellerJ. (2012). Entropy balancing for causal effects: A multivariate reweighting method to produce balanced samples in observational studies. Political Analysis, 20, 25–46. https://doi.org/10.1093/pan/mpr025
26.
HainmuellerJ.XuY. (2013). Ebalance: A Stata package for entropy balancing. Journal of Statistical Software, 54(7). https://doi.org/10.2139/ssrn.1943090
27.
HartE. R.BaileyD. H.LuoS.SenguptaP.WattsT. W. (2023). Do intervention impacts on social-emotional skills persist at higher rates than impacts on cognitive skills? A meta-analysis of educational RCTs with follow-up (Working Paper No. 23–782). Annenberg Institute for School Reform at Brown University.
28.
HelmerhorstK. O.Riksen-WalravenJ. M. A.FukkinkR. G.TavecchioL. W.Deynoot-SchaubM. J. G. (2017). Effects of the caregiver interaction profile training on caregiver–child interactions in Dutch child care centers: A randomized controlled trial. Child & Youth Care Forum, 46, 413–436. https://doi.org/10.1007/s10566–016–9383–9
29.
HøjenA.BlesesD.DaleP. S. (2022). Language assessments for preschool children: Validity and reliability of two new instruments administered by childcare educators. Cambridge University Press.
30.
HuttenlocherP. R. (2009). Neural plasticity: The effects of environment on the development of the cerebral cortex. Harvard University Press.
31.
JusticeL. M.McGintyA. S.CabellS. Q.KildayC. R.KnightonK.HuffmanG. (2010). Language and literacy curriculum supplement for preschoolers who are academically at risk: A feasibility study. Language, Speech, and Hearing Services in Schools, 41, 161–178. https://doi.org/10.1044/0161–1461(2009/08–0058
KrejslerJ. B. (2012). Quality reform and «the learning pre-school child» in the making–Potential implications for Danish pre-school teachers. Nordic Studies in Education, 32, 98–112.
34.
LandryS. H.ZuckerT. A.TaylorH. B.SwankP. R.WilliamsJ. M.AsselM.CrawfordA.HuangW.Clancy-MenchettiJ.LoniganC. J.PhillipsB. M.EisenbergN.SpinradT. L.de VilliersJ.de VilliersP.BarnesM.StarkeyP.KleinA., & School Readiness Research Consortium. (2014). Enhancing early child care quality and learning for toddlers at risk: the responsive early childhood program. Developmental Psychology, 50, 526–541. https://doi.org/10.1037/a0033494
35.
LindebergN H.HansenA. T.VixøK.MadsenD. C.BjerreL. B.LundbyA.MahoneyA. N.LautrupM. A. (2023). Kvalitet i dagtilbud – National undersøgelse af kvalitet i pædagogiske læringsmiljøer og rammer i kommunale daginstitutioner og dagplejen for 0–2-årige børn [Quality in day care – National survey of quality in educational learning environments and frameworks in municipal day care institutions and day care for 0–2 year old children]. VIVE.
36.
LoganJ. A.PiastaS. B.PurtellK. M.NicholsR.SchachterR. E. (2023). Early childhood language gains, kindergarten readiness, and Grade 3 reading achievement. Child Development, 95, 609–624. https://doi.org/10.1111/cdev.14019
37.
LoniganC. J.AnthonyJ. L.PhillipsB. M.PurpuraD. J.WilsonS. B.McQueenJ. D. (2009). The nature of preschool phonological processing abilities and their relations to vocabulary, general cognitive abilities, and print knowledge. Journal of Educational Psychology, 101, 345–358. https://doi.org/10.1037/a0013837
38.
MasekL. R.RamirezA. G.McMillanB. T.Hirsh-PasekK.GolinkoffR. M. (2021). Beyond counting words: A paradigm shift for the study of language acquisition. Child Development Perspectives, 15, 274–280. https://doi.org/10.1111/cdep.12425
39.
MashburnA.JusticeL. M.McGintyA.SlocumL. (2016). The impacts of a scalable intervention on the language and literacy development of rural pre-kindergartners. Applied Developmental Science, 20, 61–78. https://doi.org/10.1080/10888691.2015.1051622
40.
Ministry of Children and Social Affairs. (2018). Velfærdspolitisk Analyse: Personale i daginstitutioner - normering og uddannelse. [Welfare policy analysis: Staff in childcare institutions - Norms and training].
41.
Organisation for Economic Co-operation and Development. (2023). Education at a glance 2023: OECD indicators. https://doi.org/10.1787/e13bef63-en
42.
RogdeK.HagenÅ. M.Melby-LervågM.LervågA. (2019). The effect of linguistic comprehension instruction on generalized language and reading comprehension skills: A systematic review. Campbell Systematic Reviews, 15, Article e1059. https://doi.org/10.1002/cl2.1059
43.
RosholmM.PaulA.BlesesD.DaleP.HøjenA.JensenP.JusticeL. M.AndersenS. C. (2021). Are impacts of early interventions in the Scandinavian welfare state consistent with a Heckman curve? A meta-analysis. Journal of Economic Survey, 35, 106–140.
44.
ShonkoffJ. P.PhillipsD. (2000). From neurons to neighborhoods: The science of early childhood development. National Academy Press.
SilvermanR. D.JohnsonE.KeaneK.KhannaS. (2020). Beyond decoding: A meta-analysis of the effects of language comprehension interventions on K–5 students’ language and literacy outcomes. Reading Research Quarterly, 55, S207–S233. https://doi.org/10.1002/rrq.346
47.
SuggateS.SchaughencyE.McAnallyH.ReeseE. (2018). From infancy to adolescence: The longitudinal links between vocabulary, early literacy skills, oral narrative, and reading comprehension. Cognitive Development, 47, 82–95. https://doi.org/10.1016/j.cogdev.2018.04.005
48.
VachW.BlesesD.JørgensenR. N. (2010). Construction of a Danish CDI short form for language screening at the age of 36 months: Methodological considerations and results. Clinical Linguistics & Phonetics, 24(8), 602–621. https://doi.org/10.3109/02699201003710606
49.
WalkerD.SepulvedaS. J.HoffE.RoweM. L.SchwartzI. S.DaleP. S.PetersonC. A.DiamondK.Goldin-MeadowS.LevineS. C. (2020). Language intervention research in early childhood care and education: A systematic survey of the literature. Early Childhood Research Quarterly, 50, 68–85. https://doi.org/10.1016/j.ecresq.2019.02.010
50.
WeilandC.McCormickM.MatteraS.MaierM.MorrisP. (2018). Preschool curricula and professional development features for getting to high-quality implementation at scale: A comparative review across five trials. AERA Open, 4. https://doi.org/10.1177/2332858418757735
51.
WernerC. D.VermeerH. J.LintingM.Van IJzendoornM. H. (2018). Video-feedback intervention in center-based child care: A randomized controlled trial. Early Childhood Research Quarterly, 42, 93–104. https://doi.org/10.1016/j.ecresq.2017.07.005
52.
WilliamsK. T. (2007). EVT-2: Expressive vocabulary test. Pearson Assessments.
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