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Late neuropsychological outcomes in preterm infants of normal IQ: selective vulnerability of the visual system
1Children's Hospital, Boston, Massachusetts 02115, USA.
Insights
Extremely low birth weight (ELBW) children show poorer math and visual processing skills. This highlights neurobehavioral vulnerabilities associated with preterm birth and low birth weight.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Birth weight is a critical factor influencing child development.
- Neuropsychological outcomes can be affected by variations in birth weight, particularly in preterm infants.
- Understanding these effects is crucial for early intervention and support.
Purpose of the Study:
- To evaluate the relationship between different birth weight groups and neuropsychological outcomes in children aged 7-10 years.
- To identify specific cognitive and academic areas affected by extremely low birth weight (ELBW) and very low birth weight (VLBW).
- To investigate the impact of birth weight on visual processing and visuomotor integration.
Main Methods:
- A cohort of 635 children, aged 7-10 years, was assessed across four birth weight categories: <= 1,000 g, 1,001-1,500 g, 1,501-2,500 g, and > 2,500 g.
- Neuropsychological tests included measures of IQ (Verbal, Performance, Full-scale), reading, mathematics, Rey-Osterrieth Complex Figure, and Beery Test of Visuomotor Integration.
- Statistical analyses examined the association between birth weight groups and various neuropsychological outcomes, controlling for IQ levels.
Main Results:
- The prevalence of low IQ (< 85) was significantly related to birth weight.
- Among children with IQ > 84, extremely low birth weight (ELBW) children performed significantly poorer in mathematics compared to heavier birth weight groups.
- ELBW and very low birth weight (VLBW) children demonstrated poorer performance on the Rey-Osterrieth Complex Figure, a measure of complex visual processing, compared to children with higher birth weights.
Conclusions:
- Results indicate that extremely low birth weight (ELBW) is associated with specific neurobehavioral vulnerabilities, particularly in mathematical abilities and complex visual processing.
- While birth weight did not significantly impact overall IQ or reading achievement in children with average to above-average IQ, deficits in specific domains were observed.
- These findings underscore the heightened neurobehavioral vulnerability of visual processing and mathematical skills to the effects of preterm birth and low birth weight.
Abstract:
Evaluated neuropsychological outcomes in 635 children, ages 7 to 10 years, in relation to birth weight group: < or = 1,000 g; 1,001-1,500 g; 1,501-2,500 g, and > 2,500 g. The prevalence of low IQ (< 85) was related to birth weight. Among children with IQ > 84 (N = 475): (a) Birth weight was unrelated to Verbal IQ, Performance IQ, Full-scale IQ, or reading achievement; (b) extremely low birth weight (ELBW) children achieved more poorly in mathematics than did other birth weight groups (p < .05); (c) ELBW and very low birth weight children performed more poorly on the Rey-Osterrieth Complex Figure, a complex visual processing task, than did heavier birth weight children (p < .05), but performance on the Beery Test of Visuomotor Integration was not related to birth weight. Results are consistent with heightened neurobehavioral vulnerability of visual processing to preterm birth.