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Child care, socio-economic status and problem behavior: a study of gene-environment interaction in young Dutch twins

Christel M Middeldorp1, Diane J Lamb, Jacqueline M Vink

  • 1Netherlands Twin Register, Department Biological Psychology, VU University, Van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands, c.m.middeldorp@vu.nl.

Behavior Genetics
|June 1, 2014
PubMed

Insights

Formal child care before age 4 is linked to more externalizing behaviors, particularly in low socioeconomic status (SES) families. Heritability of behavior decreases in these conditions, suggesting greater environmental influence.

Area of Science:

  • Developmental Psychology
  • Behavioral Genetics
  • Child Development

Background:

  • Early childhood experiences significantly shape behavioral development.
  • Socioeconomic status (SES) is a known moderator of child development outcomes.
  • Understanding the interplay between genetics and environment in behavior is crucial.

Purpose of the Study:

  • To investigate the impact of formal child care on behavioral problems in young children.
  • To examine formal child care as a moderator of genetic and non-genetic influences on behavior.
  • To assess the role of sex and parental SES in these associations.

Main Methods:

  • Analysis of a large Dutch twin cohort (N=18,932).
  • Assessment of behavioral problems at ages 3, 5, and 7.
  • Statistical modeling to evaluate the effects of formal child care and its interaction with genetic/environmental factors, sex, and SES.

Main Results:

  • A small association was found between formal child care and increased externalizing problems, especially in low SES contexts.
  • Heritability of behavioral problems was lower in children attending formal child care and in lower SES conditions.
  • These effects were most pronounced at age 7 for externalizing problems, with environmental influences explaining the decrease in heritability.

Conclusions:

  • Formal child care, particularly in low SES environments, may increase behavioral problems by enhancing environmental influences.
  • Findings support a bioecological model where heritability is reduced in environments associated with higher problem behavior.
  • Early care environments interact with genetic predispositions to influence child behavior trajectories.

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