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Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Mediators of behavioral problems in 7-year-old children born after 24 to 28 weeks of gestation
L Nadeau1, M Boivin, R Tessier
1Research Center, H pital Ste-Justine, Montreal, Quebec, Canada. line.nadeau@psy.ulaval.ca
Insights
Extremely preterm (EP) very low birth weight (VLBW) children exhibit more behavior problems, but this link disappears when considering neuromotor and intellectual factors. These developmental delays, not prematurity itself, explain later behavioral issues in EP/VLBW children.
Area of Science:
- Developmental Psychology
- Pediatric Neurology
- Behavioral Science
Background:
- Prematurity is associated with developmental challenges.
- Understanding the pathways linking prematurity to later behavior problems is crucial.
Purpose of the Study:
- To investigate if neuromotor and intellectual functioning mediate the relationship between extreme prematurity and school-age behavior problems.
- To identify specific developmental factors contributing to behavioral outcomes in extremely preterm children.
Main Methods:
- Compared extremely preterm/very low birth weight (EP/VLBW) children with normal birth weight (NBW) controls.
- Assessed neuromotor, intellectual, and working memory at preschool age.
- Evaluated behavior problems at school age using peer, teacher, and parent reports.
Main Results:
- EP/VLBW children showed poorer IQ and neuromotor development compared to NBW children.
- EP/VLBW children exhibited more sensitive/isolated, inattentive, and hyperactive behaviors.
- The association between prematurity and behavior problems was mediated by intellectual and neuromotor delays.
Conclusions:
- Extreme prematurity indirectly impacts school-age behavior through neuromotor and intellectual deficits.
- Specific factors like working memory and general intellectual delay explain different behavioral issues.
- Family adversity also contributed to inattentive behaviors.
Abstract:
We tested the hypothesis that prematurity acts through its association with neuromotor and intellectual functioning to explain behavior problems at school age. Sixty-one extremely preterm (EP) very low birth weight (VLBW) children (< 29 wk and < 1,500 g) born in 1987-1990 and 44 normal birth weight children (NBW) (> 37 wk and > 2,500 g) were matched for age, sex, and socioeconomic status (SES). Mediator variables were evaluated at a hospital at 5 years and 9 months. Behaviors were evaluated at school at 7 years by peers, teachers, and parents. When compared with NBW children, EP/VLBW children had poorer IQ and neuromotor development. At school, EP/VLBW children were evaluated by peers as more sensitive/ isolated, and by teachers and parents as more inattentive and hyperactive than NBW. When mediators were introduced, the previously significant relation between prematurity and behavior problems disappeared. Hyperactive and inattentive behaviors were explained by a specific working memory factor for the latter, and by a general intellectual delay for the former, whereas sensitive/isolated behaviors were best explained by neuromotor delays. Inattentive behaviors were also related to family adversity. At school age, extreme prematurity had thus an indirect effect on behaviors via specific and nonspecific intellectual and neuromotor delays.
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