Abstract
Introduction Deficits in executive functioning, especially in inhibitory control, are present in children born very premature and/or with very low birth weight (VP/VLBW) and in children with attention-deficit/hyperactivity disorder (ADHD).Objective To evaluate whether ADHD imposes additional inhibitory control (IC) deficits in preschoolers born VP/VLBW.Methods 79 VP/VLBW (4 to 7 years) children were assessed for ADHD using the Schedule for Affective Disorders and Schizophrenia for School Aged Children – Present and Lifetime Version (K-SADS-PL). IC was measured with Conners’ Kiddie Continuous Performance Test (K-CPT 2) and the Behavior Rating Inventory of Executive Function – Preschool Version (BRIEF-P).Results: No significant differences were found between ADHD (n = 24) and non-ADHD children (n = 55) for any of the measures (p = 0.062 to p = 0.903). Both groups had deficits in most K-CPT 2 scores compared to normative samples, indicating poor IC and inconsistent reaction times.Conclusions ADHD does not aggravate IC deficits in VP/VLBW children. Either neuropsychological tasks and parent reports of executive functions (EFs) may not be sensitive enough to differentiate VP/VLBW preschoolers with and without ADHD, or these children’s EFs are already so impaired that there is not much room for additional impairments imposed by ADHD.
Highlights
Deficits in executive functioning, especially in inhibitory control, are present in children born very premature and/or with very low birth weight (VP/VLBW) and in children with attention-deficit/ hyperactivity disorder (ADHD)
The frequency of anxiety disorders was similar between groups, but the ADHD group had significantly higher rates of ODD, which is in line with previous literature.[24]
Contrary to our original hypothesis, our results revealed no significant differences in inhibitory control between VP/VLBW children with and without ADHD
Summary
Especially in inhibitory control, are present in children born very premature and/or with very low birth weight (VP/VLBW) and in children with attention-deficit/ hyperactivity disorder (ADHD). Objective: To evaluate whether ADHD imposes additional inhibitory control (IC) deficits in preschoolers born VP/VLBW. Results: No significant differences were found between ADHD (n = 24) and non-ADHD children (n = 55) for any of the measures (p = 0.062 to p = 0.903). Both groups had deficits in most K-CPT 2 scores compared to normative samples, indicating poor IC and inconsistent reaction times. Prematurity can be classified according to birth weight: extremely low birth weight (ELBW): < 1,000 grams and very low birth weight (VLBW): 1,000 to < 1,500 grams.[1,2] Our study will focus on very preterm and/or very low birth weight (VP/VLBW) children.
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