Snap Score Calculator

The SNAP-IV scale assesses behavioral symptoms through specific questionnaire items divided into distinct clinical subscales. The Inattention subset aggregates items 1 through 9: Inattention = Item1 + Item2 + Item3 + Item4 + Item5 + Item6 + Item7 + Item8 + Item9. The Hyperactivity-Impulsivity subset combines items 10 through 18: Hyperactivity = Item10 + Item11 + Item12 + Item13 + Item14 + Item15 + Item16 + Item17 + Item18. Finally, the Oppositional Defiant subset compiles items 19 through 26: Opposition = Item19 + Item20 + Item21 + Item22 + Item23 + Item24 + Item25 + Item26. Each item is typically scored on a 4-point Likert scale from 0 to 3, and subset totals are averaged to determine symptom severity.

Imagine a parent completing the SNAP-IV questionnaire for a child. For the first nine inattention items, the responses yield a total sum of 18 points. Dividing this sum by the 9 items gives an average inattention subset score of 18 / 9 = 2.0. For the hyperactivity items (items 10 through 18), the respondent accumulates a total sum of 13.5 points, resulting in an average subset score of 13.5 / 9 = 1.5. For the opposition items (19 through 26), suppose the total sum is 8 points across 8 items, giving an average subset score of 8 / 8 = 1.0. These calculated averages help clinicians compare the individual's scores against established normative data to determine if further diagnostic evaluation is warranted.

To ensure the most accurate reflection of behavioral patterns, observe the individual across multiple settings, such as both home and school, as symptoms can vary significantly by environment. Always consult with a qualified healthcare professional rather than relying solely on self-scored or preliminary rating scales for formal diagnoses. Consistency is key, so try to base ratings on typical behaviors observed over the past six months rather than isolated incidents.