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The rearing environment and the risk for alcohol use disorder: a Swedish national high-risk home-reared v. adopted co-sibling control study

Published online by Cambridge University Press:  22 April 2020

Kenneth S. Kendler Open the ORCID record for Kenneth S. Kendler [Opens in a new window] ,
Henrik Ohlsson ,
Jan Sundquist  and
Kristina Sundquist
Kenneth S. Kendler*
Affiliation:
Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, VA, USA Department of Psychiatry, Virginia Commonwealth University, Richmond, VA, USA
Henrik Ohlsson
Affiliation:
Center for Primary Health Care Research, Lund University, Malmö, Sweden
Jan Sundquist
Affiliation:
Center for Primary Health Care Research, Lund University, Malmö, Sweden Department of Family Medicine and Community Health, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, USA
Kristina Sundquist
Affiliation:
Center for Primary Health Care Research, Lund University, Malmö, Sweden Department of Family Medicine and Community Health, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, USA
*
Author for correspondence: Kenneth S. Kendler, E-mail: [email protected]
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Abstract

Background

Although alcohol use disorder (AUD) runs strongly within families, studies examining the impact of rearing environment, unconfounded by genetic effects, are rare and, to date, contradictory. We here seek to conduct such a study using an adoptive co-sib control design.

Methods

Defining high-risk as having ⩾1 biological parent with an externalizing syndrome (AUD, drug abuse or crime), we identified 1316 high-risk full-sibships and 4623 high-risk half-sibships containing at least one member who was home-reared and one who was adopted-away. Adoptive families are carefully screened in Sweden to provide high-quality rearing environment for adoptees. AUD was assessed from national medical, criminal and pharmacy registries.

Results

Controlling for sex, parental age at birth, and, for half-siblings, affection status of the non-shared parent, hazard ratios (±95% CI) for AUD in the matched adopted v. home-reared full- and half-siblings were, respectively, 0.76 (0.65–0.89) and 0.77 (0.70–0.84). The protective effect of adoption on AUD risk was stronger in the full- and half-sibling pairs with very high familial liability (two high-risk parents) and significantly weaker when the adoptive family was broken by death or divorce or contained a high-risk adoptive parent.

Conclusions

In both full- and half-sibling pairs, we found evidence that the rearing environment substantially impacts on the risk for AUD. High-quality rearing environments can meaningfully reduce the risk for AUD, especially in those at high familial risk.

Keywords

Adoptionalcohol use disorderrearing
Type
Original Article
Information
Psychological Medicine , Volume 51 , Issue 14 , October 2021 , pp. 2370 - 2377
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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