Stop signal and Conners' continuous performance tasks: test--retest reliability of two inhibition measures in ADHD children.
OBJECTIVE
To measure test-retest reliability of the Stop-Signal Task (SST) and the Conners' Continuous Performance Test (CPT) in children with ADHD.


METHODS
12 children with ADHD (age 11.46 +/-1.66) participated in the study. Primary outcome measures were stop-signal reaction time (SSRT) for the SST and CPT's commission errors (%FP). For each participant, we acquired three morning (8:00am) measurements and behavioral observations, separated by two 7-day intervals. Reliability of cognitive measures and behavioral observations was measured using the Intraclass-correlation coefficient (ICC).


RESULTS
ICC values for SSRT and %FP were 0.72. Consistency of behavioral observations was much lower (ICC =0.41).


CONCLUSIONS
Both the SST and the CPT yielded reliable measurements in ADHD children. Our findings lend further support to using these measures in the study of ADHD.
University of Toronto, Ontario, Canada.
Noam
N
Soreni
Jennifer
J
Crosbie
Abel
A
Ickowicz
Russell
R
Schachar
D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D005260:Female; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D010552:Personality Assessment / Q000706:statistics & numerical data; D011594:Psychometrics / Q000706:statistics & numerical data; D011597:Psychomotor Performance; D011930:Reaction Time; D015203:Reproducibility of Results