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Changing cognitive outcome in preterm infants with hyaline membrane disease
Insights
Preterm survivors of hyaline membrane disease showed improved cognitive scores over time. Higher socioeconomic status correlated with better test performance, suggesting environmental factors play a role in development.
Area of Science:
- Neonatal Medicine
- Developmental Psychology
- Pediatric Neurology
Background:
- Hyaline membrane disease (HMD) affects preterm infants, posing risks to long-term neurodevelopment.
- Longitudinal studies are crucial for understanding the developmental trajectory of HMD survivors.
Purpose of the Study:
- To assess the long-term psychological development of preterm infants surviving hyaline membrane disease.
- To identify factors influencing cognitive outcomes in this population.
Main Methods:
- Follow-up of 174 preterm survivors of HMD (born 1961-1971) for at least six years.
- Serial psychological and neurological evaluations, including preschool and school-age cognitive testing.
- Correlation analysis with perinatal variables, disease severity, and socioeconomic factors.
Main Results:
- Mean preschool cognitive score was 91 (SD=13), increasing to 101 (SD=16) at school age (p<0.05).
- No significant correlation found between perinatal factors or HMD severity and cognitive scores.
- Higher paternal educational and employment levels positively correlated with higher cognitive test scores.
Conclusions:
- Preterm survivors of HMD demonstrate cognitive score improvement into school age.
- Socioeconomic status appears to be a significant factor in cognitive development for this cohort.
- Improved scores may reflect maturation, changing cognitive assessments, or reduced impact of prematurity.
Abstract:
One hundred seventy-four preterm survivors of hyaline membrane disease, born 1961 through 1971, were followed up for at least six years with serial psychological and neurological evaluations. This relatively mature population had a mean birth weight of 2,133 g and gestational age of 34.6 weeks. All children had consecutive preschool and school age psychological tests. The mean preschool test score was 91 (SD = 13) and the mean school age score was 101 (SD = 16). The ten-point difference between the mean preschool and school age test scores was significant. Perinatal variables and indexes of disease severity did not correlate with test scores. Higher test scores were correlated with higher paternal educational and employment levels. Improving test scores by school age may be due to test instruments that measure different cognitive skills and/or the diminishing effects of prematurity.