Criminal offending and the family environment: Swedish national high-risk home-reared and adopted-away co-sibling control study

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Abstract

Background: Criminal offending is strongly transmitted across generations. Aims: To clarify the contribution of rearing environment to crossgenerational transmission of crime. Method: Using Swedish national registries, we identified 1176 fullsibling and 3085 half-sibling sets from high-risk families where at least one sibling was adopted and the other raised by the biological parents. Results: Risk for criminal conviction was substantially lower in the fulland half-siblings who were adopted v. home-reared (hazard ratios (HR)= 0.56, 95% CI 0.50-0.64 and 0.60, 95% CI 0.56-0.65, respectively). The protective effect of adoption was significantly stronger in sibships with two v. one high-risk parent. Conclusions: Using matched high-risk full- and half-siblings, we found replicated evidence that (a) rearing environment has a strong impact on risk for criminal conviction, (b) high-quality rearing environments have especially strong effects in those at high familial risk for criminal offending and (c) the protective effects of adoption are stronger for more severe crimes and for repeated offending.

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APA

Kendler, K. S., Morris, N. A., Ohlsson, H., Lönn, S. L., Sundquist, J., & Sundquist, K. (2016). Criminal offending and the family environment: Swedish national high-risk home-reared and adopted-away co-sibling control study. British Journal of Psychiatry, 209(4), 294–299. https://doi.org/10.1192/bjp.bp.114.159558

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