The Swanson, Nolan and Pelham Teacher and Parent Rating Scale (SNAP), developed by James Swanson, Edith Nolan and William Pelham, is a 90-question self-report inventory designed to measure attention deficit hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) symptoms in children and young adults.
Each question measures the frequency of a variety of symptoms or behaviors, in which the respondent indicates whether the behavior occurs "not at all", "just a little", "quite a bit", or "very much". The questionnaire takes about 10 minutes to complete and is designed for use with children and young adults ages 6–18. The questionnaire is currently in its 4th version, and its scores have shown good reliability and validity across multiple different study samples.
Swanson, Nolan and Pelham Teacher and Parent Rating Scale Wikipedia
Scoring the SNAP-IV is based on a 0-3 scale, with each question being scored as follows based on participant response:0 points: "not at all"
1 point: "just a little"
2 points: "quite a bit"
3 points: "very much"
The questions measure different domains of ADHD and ODD. The item breakdown is as follows:1-10: Measures attention deficit hyperactivity disorder inattention symptoms
11-20: Measures attention deficit hyperactivity disorder hyperactivity/impulsivity symptoms
21-30: Measures ODD symptoms
31-40: Measures "general childhood problems"
41-80: Measures non-ADHD disorders
81-90: Measures academic performance and deportment
Subscale scores add all scores on the items in the subset and divided by the total number of items in the subset. Subscale score cutoffs for the disorders are as follows:ADHD inattentive type: Teacher score of 2.56, parent score of 1.78.
ADHD hyperactive/impulsive type: Teacher score of 1.78, parent score of 1.44.
ADHD combined type: Teacher score of 2.00, parent score of 1.67.
ODD: Teacher score of 1.38, parent score of 1.88.