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Cumulative social risk exposure, infant birth weight, and cognitive delay in infancy

Erika R Cheng1, Julie Poehlmann-Tynan2, John Mullahy3

  • 1Division of General Academic Pediatrics, Center for Child and Adolescent Health Research and Policy, Harvard Medical School and the Massachusetts General Hospital for Children, Boston, Mass.

Academic Pediatrics
|December 3, 2014
PubMed

Insights

Exposure to multiple social risks significantly increases the odds of cognitive delay in infants. Birth weight partially mediates this relationship, highlighting the need for social context interventions.

Area of Science:

  • Developmental Pediatrics
  • Social Epidemiology
  • Child Psychology

Background:

  • Social risk factors are prevalent in early childhood.
  • Cognitive delay in infancy can have long-term consequences.
  • Understanding mediating factors is crucial for intervention.

Purpose of the Study:

  • To examine the cumulative effect of social risks on cognitive delay at 9 months.
  • To investigate the mediating role of obstetric factors, specifically birth weight, in this relationship.

Main Methods:

  • Utilized data from 8950 mother-child dyads in the Early Childhood Longitudinal Study, Birth Cohort.
  • Defined cognitive delay as the lowest 10% of mental scale scores (Bayley Short Form-Research Edition).
  • Employed staged multivariable logistic regressions to analyze social risk index and mediation by obstetric factors.

Main Results:

  • A dose-response relationship was observed: cognitive delay increased with the number of social risks.
  • Multiple social risk factors were associated with significantly higher odds of cognitive delay (aOR 2.11).
  • The association between social risk and cognitive delay was attenuated when accounting for birth weight (P < .001).

Conclusions:

  • A significant cumulative relationship exists between social risk exposure and infant cognitive delay.
  • Birth weight partially mediates the impact of social risks on cognitive development.
  • Interventions addressing the social environment are essential to improve infant developmental trajectories.
Abstract

Keywords:
birth weightchild developmentinfancylife coursesocial environment

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