Conners K–CPT 2™

Assessment Reports provide detailed information about scores from a single administration, presented both numerically and graphically. An individual's scores are compared to those in the normative sample and elevations at the scale and subscale level are indicated.
Progress Reports compare the results of two to four administrations for the same individual to measure changes over time. These reports are ideal to use when monitoring treatment and intervention effectiveness.

The performance-based assessment uses pictures of objects (e.g. boat, soccer ball, train) that are familiar to young children. The child is asked to respond to targets (all objects except the soccer ball) and refrain from responding to non-targets (the soccer ball) that appear on the computer screen. The Conners K-CPT 2 uses two Inter-Stimulus Intervals (ISIs) of 1.5 or 3 seconds to prevent the practice effects that can occur as respondents learn to predict and prepare for stimuli. Each Conners K-CPT 2 administration includes five blocks, each containing a 20-trial sub-block of 1.5-second ISIs and a 20-trial sub-block of 3-second ISIs (200-trial total).

Reliability

Internal Consistency

Split-half reliability estimates:

Median r= .87 to .89 across gender groups in norm sample

Median r = .86 to .89 across gender in clinical sample

Test-Retest:

Median r= .57

Interval between test administrations: 8 to 34 days

Validity

Discriminative Validity (analysis of variance):

Conners K-CPT 2 accurately discriminates between clinical and non-clinical groups. Both an ADHD sample and a clinical non-ADHD sample scored higher than the general population sample on the majority of the Conners K-CPT 2 scores.

Incremental Validity:

Including Conners K-CPT 2 as part of a battery of assessments contributes to a more accurate prediction of clinical conditions. Adding the Conners K-CPT 2 to a broadband emotional and behavioural rating scale (Conners EC-P) increases the ability to predict group membership (ADHD) versus general population groups.

Development of the Conners K–CPT 2 was based on a normative sample of 320 four- through seven-year-old children. The normative sample was stratified to match the U.S. Census on a number of key demographic variables including gender, age, region, race/ethnicity, and parental education level. An additional clinical sample of over 100 cases of children diagnosed with ADHD and other clinical disorders were also collected.