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Updated: May 3, 2026

Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Children born extremely preterm show significant lower cognitive, language and motor function levels compared with
1Department of Psychology, Lund University, Lund, Sweden.
Insights
Children born extremely preterm show significant developmental delays in cognitive, communication, and motor functions by 2.5 years compared to term-born peers. The Bayley Scales of Infant and Toddler Development (Bayley-III) provide detailed insights into these outcomes.
Area of Science:
- Neonatal development
- Pediatric neurodevelopment
- Developmental pediatrics
Background:
- Extreme prematurity (born before 27 weeks gestation) poses significant risks for long-term neurodevelopmental outcomes.
- Population-based studies are crucial for understanding the prevalence and spectrum of developmental challenges in extremely preterm infants.
Purpose of the Study:
- To evaluate the developmental status of extremely preterm children at 2.5 years of age.
- To compare developmental outcomes between extremely preterm infants and a term-born control group.
- To identify specific domains of delay in extremely preterm children.
Main Methods:
- Utilized the population-based Extremely Preterm Infants in Sweden Study (EXPRESS).
- Assessed 399 extremely preterm children and 366 term-born controls using the Bayley Scales of Infant and Toddler Development, third edition (Bayley-III).
- Evaluated cognitive, communication (receptive and expressive), and motor (fine and gross) functions.
Main Results:
- Extremely preterm children exhibited significantly lower performance across all Bayley-III assessed domains compared to controls.
- Prevalence of moderate-to-severe developmental delay was notable: 10.8% cognitive, 14.9% receptive communication, 14.5% expressive communication, 12.4% fine motor, and 7.0% gross motor.
- Significant intra-index performance variations were observed, indicating nuanced developmental profiles.
Conclusions:
- Extremely preterm children experience significant deficits in cognitive, communicative, and motor functions at 2.5 years.
- The Bayley-III is a valuable tool for obtaining detailed developmental information in extremely preterm populations.
- Early identification and targeted interventions are essential for improving outcomes in this vulnerable group.
Aim:
To assess developmental outcomes of children aged 2.5 years born extremely preterm.
Methods:
As a part of the population-based Extremely Preterm Infants in Sweden Study (EXPRESS), 399 children born before 27 weeks of gestation and 366 control children born at term were assessed with the Bayley Scales of Infant and Toddler Development, third edition (Bayley-III), assigning scores for cognition, receptive and expressive communication, fine and gross motor functions. Based on control group means, prevalences of developmental delay in the preterm group were calculated. Mean score differences between subtests constituting the overall Bayley-III indices were analysed within both groups.
Results:
After controlling for socio-demographic, child and assessment variables, analyses showed significantly lower performances of the preterm group compared with the control group on the Bayley-III subtests. Prevalence of moderate-severe delay was 10.8% in cognitive, 14.9% in receptive communication, 14.5% in expressive communication, 12.4% in fine motor and 7.0% in gross motor functions. Significant differences between performances on subtests included in the same indices were detected.
Conclusion:
Extremely preterm children show significant lower cognitive, communicative and motor function levels at 2.5 years compared with children born at term. Bayley-III assessments permit the acquisition of nuanced information about development following extreme prematurity.
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