Internal consistency, temporal stability, and reproducibility of individual index scores of the Test of Variables of Attention in children with attention-deficit/hyperactivity disorder

Psychometric properties of the Test of Variables of Attention (TOVA) were e xamined in a cohort of children (n = 63) strictly diagnosed with attention- deficit/hyperactivity disorder (AD/HD). Internal consistency was assessed v ia correlational analyses to determine the degree of agreement among variou s test portions. The temporal stability of errors of omission, errors of co mmission, response time, and response time variability was evaluated using test-retest reliability. Reproducibility of individual scores for the same indices was assessed using the Bland-Altman procedure. Select TOVA index sc ores exhibited high internal consistency in this cohort. Although the tempo ral stability of group scores (test-retest reliability) was satisfactory, i ndividual test scores were less reproducible. Temporal stability and indivi dual test-retest score agreement were greater for response time and respons e time variability than for errors of omission and errors of commission. (C ) 2001 National Academy of Neuropsychology. Published by Elsevier Science L td.