Objective:
To assess the extent to which social and family factors explain variability in cognitive, language, and motor development among very preterm (VPT; <30 weeks of gestation) children from 2 to 5 years of age.
Study design:
As part of a longitudinal study, VPT children recruited as neonates were assessed at 2 (n=87) and 5 (n=83) years using standardized tests of cognitive, language, and motor ability alongside demographically-matched full term (FT) children (n=63). For VPT children, developmental change scores were calculated for each domain to assess within-individual variability to 5 years of age. Multivariate regression and mixed-effect models examined social risk index, parenting stress, family functioning, and maternal intellectual ability as predictors of developmental variation among VPT children.
Results:
VPT children demonstrated poorer cognitive, language, and motor abilities than FT children at 2 (P ≤ .001) and 5 (p<.002) years of age. Social adversity was associated with cognitive (p<.001) and language (p<.001) outcomes at both ages, with parenting stress also related to cognitive outcomes (p=.03). Infant medical risk was associated with motor outcome at 5 years (p=.01). VPT children showed considerable within-individual variation between assessments. Among VPT children, neonatal white matter abnormalities predicted worsening cognitive (p=.04) and motor development (p=.01). Social risk index predicted worsening language development (p=.04), but this association was subsequently explained by dysfunctional maternal affective involvement (p=.01) and lower maternal intellectual ability (p=.05).
Conclusions:
Both clinical and socioenvironmental factors are associated with cognitive, language and motor developmental variation among VPT children from infancy to early school age.