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Does age at adoption and geographic origin matter? A national cohort study of cognitive test performance in adult inter-country adoptees

Published online by Cambridge University Press:  29 February 2008

A. Odenstad ,
A. Hjern ,
F. Lindblad ,
F. Rasmussen ,
B. Vinnerljung  and
M. Dalen
A. Odenstad
Affiliation:
Stress Research Institute, Stockholm University, Sweden Division of Psychosocial Factors and Health, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden
A. Hjern
Affiliation:
Centre for Epidemiology, National Board of Health and Welfare, Stockholm, Sweden Department of Women's and Children's Health, Uppsala University, Sweden
F. Lindblad
Affiliation:
Stress Research Institute, Stockholm University, Sweden Department of Neuroscience, Child and Adolescent Psychiatry, University Hospital of Uppsala, Sweden
F. Rasmussen
Affiliation:
Child and Adolescent Public Health Epidemiology Group, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden
B. Vinnerljung
Affiliation:
Centre for Epidemiology, National Board of Health and Welfare, Stockholm, Sweden Institute for Evidence-based Social Work Practice, National Board of Health and Welfare, Stockholm, Sweden
M. Dalen*
Affiliation:
Department of Special Needs Education, University of Oslo, Norway
*
*Address for correspondence: M. Dalen, E.D., Ph.D., Department of Special Needs Education, University of Oslo, PB 1140, Blindern, 0317 Oslo, Norway. (Email: monica.dalen@isp.uio.no)
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Abstract

Background

Inter-country adoptees run risks of developmental and health-related problems. Cognitive ability is one important indicator of adoptees' development, both as an outcome measure itself and as a potential mediator between early adversities and ill-health. The aim of this study was to analyse relations between proxies for adoption-related circumstances and cognitive development.

Method

Results from global and verbal scores of cognitive tests at military conscription (mandatory for all Swedish men during these years) were compared between three groups (born 1968–1976): 746 adoptees born in South Korea, 1548 adoptees born in other non-Western countries and 330 986 non-adopted comparisons in the same birth cohort. Information about age at adoption and parental education was collected from Swedish national registers.

Results

South Korean adoptees had higher global and verbal test scores compared to adoptees from other non-European donor countries. Adoptees adopted after age 4 years had lower test scores if they were not of Korean ethnicity, while age did not influence test scores in South Koreans or those adopted from other non-European countries before the age of 4 years. Parental education had minor effects on the test performance of the adoptees – statistically significant only for non-Korean adoptees' verbal test scores – but was prominently influential for non-adoptees.

Conclusions

Negative pre-adoption circumstances may have persistent influences on cognitive development. The prognosis from a cognitive perspective may still be good regardless of age at adoption if the quality of care before adoption has been ‘good enough’ and the adoption selection mechanisms do not reflect an overrepresentation of risk factors – both requirements probably fulfilled in South Korea.

Keywords

Cohort studycognitive performanceintelligenceinter-country adoption
Type
Original Articles
Information
Psychological Medicine , Volume 38 , Issue 12 , December 2008 , pp. 1803 - 1814
Copyright
Copyright © 2008 Cambridge University Press

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References

Beckett, C, Maughan, M, Rutter, M, Castle, J, Colvert, E, Groothues, C, Kreppner, J, Stevens, S, O'Connor, T, Sonuga-Barka, EJS (2006). Do the effects of early severe deprivation on cognition persist into early adolescence? Findings from the English and Romanian Adoptees Study. Child Development 77, 696–711.CrossRefGoogle ScholarPubMed
Carlstedt, B (2000). Cognitive abilities – aspects of structure, process and measurement. Dissertation. University of Gothenburg: Gothenburg Studies in Educational Sciences No. 148.Google Scholar
Carlstedt, B, Mardberg, B (1993). Construct validity of the Swedish Enlistment Battery. Scandinavian Journal of Psychology 34, 353–362.CrossRefGoogle Scholar
Cederblad, M, Höök, B, Irhammar, M, Mercke, AM (1999). Mental health in international adoptees as teenagers and young adults: an epidemiological study. Journal of Child Psychology and Psychiatry 40, 1239–1248.CrossRefGoogle Scholar
Chandra, A, Abma, J, Maza, P, Bachrach, C (1999). Adoption, adoption seeking, and relinquishment for adoption in the United States. Advance Data 11, 1–16.Google Scholar
Chisholm, K (1998). A three year follow-up of attachment and indiscriminate friendliness in children adopted from Romanian orphanages. Child Development 69, 1092–1106.Google ScholarPubMed
Colombo, M, de la Parra, A, Lopez, I (1992). Intellectual and physical outcome of children undernourished in early life is influenced by later environment conditions. Developmental Medicine and Child Neurology 34, 611–622.CrossRefGoogle Scholar
Dalen, M (2001). School performances among internationally adopted children in Norway. Adoption Quarterly 5, 39–58.CrossRefGoogle Scholar
Dalen, M (2005). International adoptions in Scandinavia: research focus and main results. In Psychological Issues in Adoption. Research and Practice (ed.Brodzinsky, D. and Palacios, J.), pp. 187–211. Praeger: New York, USA.Google Scholar
Dennis, W (1973). Children of the Creche. Appleton-Century-Crofts: New York.Google Scholar
Dumaret, A (1985). IQ, scholastic performance and behaviour of sibs raised in contrasting environments. Journal of Child Psychology and Psychiatry 26, 553–580.CrossRefGoogle ScholarPubMed
Duyme, M (1988). School success and social class: an adoption study. Developmental Psychology 24, 203–209.CrossRefGoogle Scholar
Duyme, M (1990). Antisocial behavior and postnatal environment: a French adoption study. Journal of Child Psychology and Psychiatry 31, 699–710.CrossRefGoogle ScholarPubMed
Duyme, M, Dumaret, A-C, Tomekiewicz, S (1999). How can we boots IQs of ‘dull children’?: a late adoption study. Proceedings of the National Academy of Sciences USA 96, 8790–8794.CrossRefGoogle Scholar
Elmund, A, Lindblad, F, Vinnerljung, B, Hjern, A (2007). Intercountry adoptees in out-of-home care – a national cohort study. Acta Paediatrica 96, 437–442.CrossRefGoogle Scholar
Fergusson, DM, Horwood, LJ, Ridder, EM (2005). Show me the child at seven. II: Childhood intelligence and later outcomes in adolescence and young adulthood. Journal of Child Psychology and Psychiatry 46, 850–858.CrossRefGoogle ScholarPubMed
Fonseca, C (2002). Unexpected reversal. Charting the course of international adoption in Brazil. Adoption & Fostering 26, 28–39.CrossRefGoogle Scholar
Frydman, M, Lynn, R (1989). The intelligence of Korean children adopted in Belgium. Personality and Individual Differences 10, 1323–1325.CrossRefGoogle Scholar
Glennen, S, Masters, MG (2002). Language development and delay in internationally adopted infants and toddlers: a review. American Journal of Speech-Language Pathology 11, 333–339.CrossRefGoogle Scholar
Goodman, A, Fleitlich-Bilyk, B, Patel, V, Goodman, R (2007). Child, family, school and community risk factors for poor mental health in Brazilian schoolchildren. Journal of the American Academy of Child and Adolescent Psychiatry 46, 448–456.CrossRefGoogle ScholarPubMed
Gunnar, M, Kertes, D (2005). Prental and postnatal risks to neurobiological development in internationally adopted children. In Psychological Issues in Adoption. Research and Practice (ed.Brodzinsky, D. and Palacios, J.), pp. 27–47. Praeger: New York, USA.Google Scholar
Gunnell, D, Harrison, G, Rasmussen, F, Fouskakis, D, Tynelius, P (2002). Associations between premorbide intellectual performance, early-life exposures and early-onset schizophrenia. Cohort study. British Journal of Psychiatry 181, 298–305.CrossRefGoogle Scholar
Gunnell, D, Magnusson, PK, Rasmussen, F (2005). Low intelligence test scores in 18 year old men and risk of suicide: cohort study. British Medical Journal 330, 167.CrossRefGoogle ScholarPubMed
Hjern, A, Lindblad, F, Vinnerljung, B (2002). Suicide, psychiatric illness, and social maladjustment in intercountry adoptees in Sweden: a cohort study. Lancet 360, 443–448.CrossRefGoogle ScholarPubMed
Hjern, A, Vinnerljung, A, Lindblad, F (2004). Avoidable mortality among child welfare recipients and intercountry adoptees – a national cohort study. Journal of Epidemiology and Community Health 58, 412–417.CrossRefGoogle ScholarPubMed
Howard, JA, Smith, SL, Ryan, SD (2004). A comparative study of child welfare adoptions with other types of adopted children and birth children. Adoption Quarterly 7, 1–30.CrossRefGoogle Scholar
Howe, D (1997). Parent-reported problems in 211 adopted children: some risk and protective factors. Journal of Child Psychology and Psychiatry 38, 401–411.CrossRefGoogle ScholarPubMed
Johnson, DE (2002). Adoption and the effect on children's development. Early Human Development 68, 39–54.CrossRefGoogle ScholarPubMed
Johnson, JS, Newport, EL (1989). Critical period effects in second language learning: the influence of maturational state on the acquisition of English as a second language. Cognitive Psychology 21, 60–99.CrossRefGoogle ScholarPubMed
Judge, S (2004). The impact on early institutionalization on child and family outcomes. Adoption Quarterly 7, 31–98.CrossRefGoogle Scholar
Juffer, F, van IJzendoorn, MH (2005). Behviour problems and mental health referrals of international adoptees. A meta-analysis. Journal of the American Medical Association 293, 2501–2515.CrossRefGoogle Scholar
Kim, C, Carroll, TG (1975). Intercountry adoption of South Korean orphans: a lawyer's guide. Journal of Family Law 14, 223–253.Google Scholar
Kim, WJ (1995). International adoptiom: a case review of Korean children. Child Psychiatry and Human Development 25, 141–154.CrossRefGoogle ScholarPubMed
Kvifte-Andresen, IL (1992). Behavioral and school adjustment of 12–13 year old internationally adopted children in Norway. Journal of Child Psychology and Psychiatry 33, 427–439.CrossRefGoogle Scholar
Lenneberg, EH (1967). Biological Foundation of Language. Wiley: New York.CrossRefGoogle Scholar
Lindblad, F, Hjern, A, Vinnerljung, B (2003). Intercountry adopted children as young adults – a Swedish cohort study. American Journal of Orthopsychiatry 73, 190–202.CrossRefGoogle ScholarPubMed
Lynn, R, Vanhanen, T (2002). IQ and the Wealth of Nations. Praeger: Westport, CT.Google Scholar
Marcovitch, S, Goldberg, S, Gold, A, Washington, J, Wasson, C, Krekewich, K, Handley-Derry, M (1997). Determinants of behavioural problems in Romanian children adopted in Ontario. International Journal of Behavioural Development 20, 17–21.CrossRefGoogle Scholar
Maughan, B, Pickles, A (1990). Adopted and illegitimate children growing up. In Straight and Devious Pathways from Childhood to Adulthood (ed.Robins, L. and Rutter, M.), pp. 36–61. Cambridge University Press: New York.Google Scholar
Munro, JC, Russell, AJ, Murray, RM, Kerwin, RW, Jones, PB (2002). IQ in childhood psychiatric attendees predicts outcome of later schizophrenia at 21 year follow-up. Acta Psychiatrica Scandinavica 106, 139–142.CrossRefGoogle ScholarPubMed
Neiss, M, Rowe, DC (2000). Parental education and child's verbal IQ in adoptive and biological families in the National Longitudinal Study of Adolescent Health. Behaviour Genetics 30, 487–495.CrossRefGoogle ScholarPubMed
O'Connor, TG, Rutter, MR, Beckett, C, Keaveney, L, Kreppner, JM, ERA Study, Team (2000). The effects of global severe privation on cognitive competence: extension and longitudinal follow-up. Child Development 71, 376–390.CrossRefGoogle ScholarPubMed
Pallier, C, Dehaene, S, Poline, JB, LeBihan, D, Argenti, AM, Dupoux, E, Mehler, J (2003). Brain imaging of language plasticity in adopted adults: can a second language replace the first? Cerebral Cortex 13, 155–161.CrossRefGoogle ScholarPubMed
Plomin, R, Fulker, DW, Corley, R, DeFries, JC (1997). Nature, nurture, and cognitive development from 1 to 16 years: a parent-offspring adoption study. Psychological Science 8, 442–447.CrossRefGoogle Scholar
Repetti, RL, Taylor, SE, Seeman, TE (2002). Risky families: family social environments and the mental and physical health of offspring. Psychological Bulletin 128, 330–366.CrossRefGoogle ScholarPubMed
Roberts, JA, Pollock, KE, Krakow, R, Price, J, Fulmer, KC, Wang, P (2005). Language development in preschool-age children adopted from China. Journal of Speech, Language, and Hearing Research 48, 93–107.CrossRefGoogle ScholarPubMed
Rutter, M (2005). Adverse preadoption experiences and psychological outcomes. In Psychological Issues in Adoption. Research and Practice (ed.Brodzinsky, D. and Palacios, J.), pp. 47–67. Praeger: New York, USA.Google Scholar
Rutter, M, ERA Study Team (1998). Developmental catch-up, and deficit, following adoption after severe global early privation. Journal of Child Psychology and Psychiatry 39, 465–476.Google ScholarPubMed
Rutter, M, Kreppner, JM, O'Connor, TG, ERA Study Team (2001). Specificity and heterogeneity in children's responses to profound institutional privation. British Journal of Psychiatry 179, 97–103.CrossRefGoogle ScholarPubMed
Rutter, M, O'Connor, T, Beckett, C, Castle, J, Croft, C, Dunn, J, Groothues, C, Kreppner, J (2000). Recovery and deficit following profound early deprivation. In Intercountry Adoption (ed.Selman, P.), pp. 107–142. British Agencies for Adoption and Fostering: London.Google Scholar
Rygvold, AL (1999). Better or worse? Intercountry adopted children's language. In Mine – Yours – Ours and Theirs. Adoption, Changing Kinship and Family Patterns (ed.Rygvold, A., Dalen, M. and Sætersdal, B.), pp. 221–229. University of Oslo: Oslo. Department of Special Needs Education, Report from International Conference, Oslo, June 1999.Google Scholar
Sakai, KL (2005). Language acquisition and brain development. Science 310, 815–819.CrossRefGoogle ScholarPubMed
Scarr, S (1992). Development theories for the 1990s: development and individual differences. Child Development 63, 1–19.CrossRefGoogle ScholarPubMed
Scarr, S (1993). Biological and cultural diversity: the legacy of Darwin for development. Child Development 64, 1333–1363.CrossRefGoogle ScholarPubMed
Selman, P (2000). The demographic history of intercountry adoption. In Intercountry Adoption (ed.Selman, P.), pp. 107–142. British Agencies for Adoption and Fostering: London.Google Scholar
Shuttleworth-Edwards, AB, Kemp, RD, Rust, AL, Muirhead, JG, Hartman, NP, Radloff, SE (2004). Cross-cultural effects on IQ test performance: a review and preliminary normative indications on WAIS-III test performance. Journal of Clinical and Experimental Neuropsychology 26, 903–920.CrossRefGoogle ScholarPubMed
Stams, GJ, Juffer, F, Rispens, J, Hoksbergen, RA (2000). The development and adjustment of 7-year-old children adopted in infancy. Journal of Child Psychology and Psychiatry 41, 1025–1037.CrossRefGoogle ScholarPubMed
Statistics Sweden (2000). Standards for classifications of Swedish education [in Swedish]. Stockholm: SCB, 2000:1.Google Scholar
Statistics Sweden (2005). Multi-Generation Register. A description of contents and quality. Stockholm: SCB, 2005:2.Google Scholar
Tahk, Y (1986). Intercountry adoption program in Korea; policy, law and services. In Adoption in Worldwide Perspective (ed.Hoksbergen, R. A.-C.), pp. 79–91. Swets & Zeitlinger: Lisse.Google Scholar
Tieman, W, van der Ende, J, Verhulst, FC (2005). Psychiatric disorders in young adult intercountry adoptees: an epidemiological study. American Journal of Psychiatry 162, 592–598.CrossRefGoogle ScholarPubMed
Triseliotis, J (2000). Intercountry adoption. Global trade or global gift. Adoption & Fostering 24, 45–54.CrossRefGoogle Scholar
van IJzendoorn, MH, Juffer, F (2006). The Emanuel Miller Memorial Lecture 2006: Adoption as intervention. Meta-analytic evidence for massive catch-up and plasticity in physical, socio-emotional, and cognitive development. Journal of Child Psychology and Psychiatry 47, 1228–1245.CrossRefGoogle Scholar
van IJzendoorn, MH, Juffer, F, Klein Poelhuis, CW (2005). Adoption and cognitive development: a meta-analytic comparison of adopted and nonadopted children's IQ and school performances. Psychological Bulletin 131, 301–316.CrossRefGoogle Scholar
Verhulst, FC, Althaus, M, Verluis-den Bierman, H (1990). Problem behaviour in international adoptees. Journal of the American Academy of Child and Adolescent Psychiatry 29, 94–103.CrossRefGoogle ScholarPubMed
Verhulst, FC, Althaus, M, Verluis-den Bierman, H (1992). Damaging background: later adjustment of international adoptees. Journal of the American Academy of Child and Adolescent Psychiatry 31, 518–524.CrossRefGoogle ScholarPubMed
Vinnerljung, B, Hjern, A, Lindblad, F (2006). Suicide attempts and severe psychiatric morbidity among former child welfare clients − a national cohort study. Journal of Child Psychology & Psychiatry 47, 723–733.CrossRefGoogle ScholarPubMed
von Borczyskowski, A, Hjern, A, Lindblad, F, Vinnerljung, B (2006). Suicidal behaviour in national and international adult adoptees – a Swedish cohort study. Social Psychiatry & Psychiatric Epidemiology 41, 95–102.CrossRefGoogle ScholarPubMed
Vorria, P, Papaligoura, Z, Dunn, J, van IJzendoorn, MH, Steele, H, Kontopoulou, A, Sarafidou, J (2003). Early experiences and attachment relationships of Greek infants raised in residential group care. Journal of Child Psychology and Psychiatry 44, 1–13.CrossRefGoogle ScholarPubMed
Vorria, P, Papaligoura, Z, Sarafidou, J, Kopakaki, M, Dunn, J, van IJzendoorn, MH, Steele, H, Kontopoulou, A (2006). The development of adopted children after institutional care: a follow-up study. Journal of Child Psychology and Psychiatry 47, 1246–1253.CrossRefGoogle ScholarPubMed
Whalley, LJ, Deary, IJ (2001). Longitudinal cohort study of childhood IQ and survival up to age 76. British Medical Journal 322, 819.CrossRefGoogle ScholarPubMed
Winick, M, Meyer, KK, Harris, R (1975). Malnutrition and environmental enrichment by adoption. Science 190, 1173–1175.CrossRefGoogle ScholarPubMed