The ADHDT was designed for use in schools and clinics. The test is easily completed by teachers, parents, or others familiar with the individual. The 36 items are based on the DSM–IV™ criteria for ADHD. The three subtests represent the core symptoms necessary for ADHD diagnosis: hyperactivity, impulsivity, and inattention.
- Normed on a representative national sample of more than 1,200 persons who were diagnosed with attention-deficit disorders.
- Studies of internal consistency and test-retest reliability produced high (.90 and above) coefficients.
- Additional studies confirmed the content, construct, and criterion-related validity.