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[Prediction of IQ among children with birth weight under 1, 501 gms]
L Smith1, S E Ulvund, R Lindemann
1Psykologisk institutt Universitetet i Oslo Postboks 1094 Blindern 0317 Oslo. lars.smith@psykologi.uio.no
Insights
Predicting intelligence quotient (IQ) in preterm infants is challenging. Combining birth weight, socioeconomic status, and early cognitive development up to 56 weeks provides accurate IQ prediction by age two.
Area of Science:
- Neonatal care and developmental pediatrics.
- Neuroscience and child psychology.
Context:
- Preterm infants face significant risks of cognitive impairments.
- Accurate prediction of long-term cognitive outcomes remains a challenge.
Purpose:
- To identify predictors of intelligence quotient (IQ) at age eight years in preterm infants.
- To assess the predictive value of perinatal factors, developmental status, and socioeconomic status.
Summary:
- A study of 104 preterm infants (< or = 1,501 g birth weight) analyzed perinatal data, early cognitive development (Bayley index), and parental socioeconomic status.
- Regression analyses showed birth weight, Bayley index at 39 and 56 weeks, and socioeconomic status significantly predicted IQ at age eight.
- The Bayley index at age two years was the sole significant predictor of IQ at age eight, indicating consolidated cognitive status.
Impact:
- Early cognitive assessments in preterm infants, particularly by 56 weeks corrected age, are crucial for predicting later IQ.
- Parental socioeconomic status is a key factor in long-term cognitive outcomes for preterm children.
- This research refines prediction models for cognitive development in high-risk infant populations.
Introduction:
As a group, preterm infants are at considerable risk of cognitive difficulties. However, predicting cognitive sequelae has proved to be difficult. The current study reports on prediction of IQ at age eight years on the basis of the children's perinatal and developmental status, as well as parental socioeconomic status.
Materials And Methods:
The sample consisted of 104 infants with birth weight < or = 1,501 g (53 girls), recruited consecutively in the neonatal intensive care unit and followed up to age eight years. Perinatal status, early cognitive development, and parental socioeconomic status served as predictors. Cognitive ability assessed on two commonly used intelligence tests served as outcome. The participants did not represent a total population, and no control group was used.
Results:
Regression analyses revealed that birth weight, the Bayley cognitive index at 39 and 56 weeks, and parental socioeconomic status all made significant and independent contributions to outcome. Though the Bayley index made no significant contribution at age 29 weeks, it was the only variable at age two that was related to IQ at age eight.
Interpretation:
Perinatal data are generally of limited value for the prediction of later IQ among preterm infants. However, when combined with information about parental socioeconomic status and the infants' developmental status up to age 56 weeks, birth weight made a unique and significant contribution as a predictor of later IQ. At age two years the cognitive status of prematurely born children was sufficiently consolidated to yield a valid prediction of outcome.