TY - JOUR
T1 - Effects of IQ on executive function measures in children with ADHD
AU - Mahone, E. Mark
AU - Hagelthorn, Kathleen M.
AU - Cutting, Laurie E.
AU - Schuerholz, Linda J.
AU - Pelletier, Shelley F.
AU - Rawlins, Christine
AU - Singer, Harvey S.
AU - Denckla, Martha B.
N1 - Funding Information:
A portion of this research was presented at the 18th annual meeting of the National Academy of Neuropsychology in Washington, D.C., November 4–7, 1998. This research was supported by Grant NS-35359, Neurodevelopmental Pathways to Learning Disabilities, and by the Mental Retardation and Developmental Disabilities Research Center, Grant HD-24061.
PY - 2002/3
Y1 - 2002/3
N2 - The present study compared children with Attention-Deficit Hyperactivity Disorder (ADHD) and controls on a selected set of clinical measures of executive function (EF). A total of 92 children (51 ADHD, 41 control), ages 6-16, completed measures chosen from a larger neuropsychological battery to illustrate diverse components of the EF construct (planning, inhibitory control, response preparation, memory search). The selected measures were moderately correlated with one another, and moderately correlated with IQ. After controlling for age, sex, presence of learning disability (LD), ADHD, and IQ test version, Full Scale IQ was significantly related to four of the five selected EF measures. A second analysis showed group differences on the EF measures at different IQ levels. After covarying for age, there was a significant multivariate effect for IQ level (average, high average, superior) and a significant multivariate interaction between group (ADHD vs. control) and IQ level. Three of the five selected EF measures showed significant univariate group effects (controls performing better than ADHD) at the average IQ level; however, there were no significant group differences between children with ADHD and controls at high average or superior IQ levels. These results suggest that clinical measures of EF may differ among children with ADHD and controls at average IQ levels, but there is poorer discriminatory power for these measures among children with above average IQ.
AB - The present study compared children with Attention-Deficit Hyperactivity Disorder (ADHD) and controls on a selected set of clinical measures of executive function (EF). A total of 92 children (51 ADHD, 41 control), ages 6-16, completed measures chosen from a larger neuropsychological battery to illustrate diverse components of the EF construct (planning, inhibitory control, response preparation, memory search). The selected measures were moderately correlated with one another, and moderately correlated with IQ. After controlling for age, sex, presence of learning disability (LD), ADHD, and IQ test version, Full Scale IQ was significantly related to four of the five selected EF measures. A second analysis showed group differences on the EF measures at different IQ levels. After covarying for age, there was a significant multivariate effect for IQ level (average, high average, superior) and a significant multivariate interaction between group (ADHD vs. control) and IQ level. Three of the five selected EF measures showed significant univariate group effects (controls performing better than ADHD) at the average IQ level; however, there were no significant group differences between children with ADHD and controls at high average or superior IQ levels. These results suggest that clinical measures of EF may differ among children with ADHD and controls at average IQ levels, but there is poorer discriminatory power for these measures among children with above average IQ.
UR - http://www.scopus.com/inward/record.url?scp=0036525312&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036525312&partnerID=8YFLogxK
U2 - 10.1076/chin.8.1.52.8719
DO - 10.1076/chin.8.1.52.8719
M3 - Article
C2 - 12610776
AN - SCOPUS:0036525312
SN - 0929-7049
VL - 8
SP - 52
EP - 65
JO - Child Neuropsychology
JF - Child Neuropsychology
IS - 1
ER -