SNAP-IV 26 ADHD

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What is SNAP-IV 26

The SNAP-IV 26-item scale is an abbreviated version of the Swanson, Nolan and Pelham (SNAP) Questionnaire (Swanson, 1992; Swanson et al., 1983). Items from the DSM-IV criteria for Attention Deficit Hyperactivity Disorder (ADHD) are included for the two subsets of symptoms: inattention (items 1-9) and hyperactivity/impulsivity (items 10-18). Also, items are included from the DSM-IV criteria for Oppositional Defiant Disorder (items 19-26) because ODD is often present in children with ADHD.

SNAP-IV 26 Printable PDF

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SNAP-IV 26 Scoring and Interpretation

Symptom severity is rated on a 4-point scale. Responses are scored as follows:

Not at all = 0

Just a little = 1

Quite a bit = 2

Very much = 3

The scores in each of the three subsets (inattention, hyperactivity/impulsivity, and opposition/defiance) are totaled. A suggested scoring guideline is below:

Questions 1 – 9: Inattention Subset

< 13/27 = Symptoms not clinically significant

13 – 17 = Mild symptoms

18 – 22 = Moderate symptoms

23 – 27 = Severe symptoms

Questions 10 – 18: Hyperactivity/Impulsivity Subset

<13/27 = Symptoms not clinically significant

13 – 17 = Mild symptoms

18 – 22 = Moderate symptoms

23 – 27 = Severe symptoms

Questions 19 – 26: Opposition/Defiance Subset

< 8/24 = Symptoms not clinically significant

8 – 13 = Mild symptoms

14 – 18 = Moderate symptoms

19 – 24 = Severe symptoms

Suggested Targets:

<13/27 for inattention

<13/27 for hyperactivity/impulsivity

<8/24 for oppositional defiant disorder

If desired, the average rating for each subset can be calculated by totalling the scores for the items in the subset and dividing by the number of items. The average can be compared with cut-off scores suggestive of ADHD reported in the literature.

A suggested scoring guideline is below:

Questions 1 – 9: Inattention Subset

< 13/27 = Symptoms not clinically significant

13 – 17 = Mild symptoms

18 – 22 = Moderate symptoms

23 – 27 = Severe symptoms

Questions 10 – 18: Hyperactivity/Impulsivity Subset

<13/27 = Symptoms not clinically significant

13 – 17 = Mild symptoms

18 – 22 = Moderate symptoms

23 – 27 = Severe symptoms

Questions 19 – 26: Opposition/Defiance Subset

< 8/24 = Symptoms not clinically significant

8 – 13 = Mild symptoms

14 – 18 = Moderate symptoms

19 – 24 = Severe symptoms

PsyPack can automatically score the SNAP-IV 26 assessment and prepare corresponding tables and graphs.

Further, PsyPack automatically plots a graph to help you easily track progress over time.

Sample Report of SNAP-IV 26

Domain

Attention-Deficit/Hyperactivity Disorder (ADHD), Oppositional Defiant Disorder (ODD)

What does SNAP-IV 26 measure

The purpose of the evaluation is to:

assess ADHD core symptoms of hyperactivity/impulsivity and inattention,
along with symptoms of Oppositional Defiant Disorder (ODD).

Administration

Parent/Caregiver-administered, Teacher-administered

Type of outcome tool

Clinical

Assessment modes

Questionnaire

Age and eligibility

6 to 18 years

Estimated time

5 to 10 minutes

Notes

Since the questionnaire relies on client's observations, all responses should be verified by the clinician, and a definitive diagnosis is made on clinical grounds taking into account how well the client understood the questionnaire, as well as other relevant information from the client.

While study results suggest that SNAP-IV parent and teacher ratings satisfactorily distinguish children with different levels of ADHD concerns, findings caution against using the SNAP-IV for diagnostic purposes.

Attribution and References

James M. Swanson, Ph.D., University of California, Irvine, CA 92715

Swanson, JM. (1992). School-based Assessments and Interventions for ADD students. Irvine, CA: K.C. Publishing.

Archived link

Bussing R, Fernandez M, Harwood M, Wei Hou, Garvan CW, Eyberg SM, Swanson JM. Parent and teacher SNAP-IV ratings of attention deficit hyperactivity disorder symptoms: psychometric properties and normative ratings from a school district sample. Assessment. 2008 Sep;15(3):317-28. doi: 10.1177/1073191107313888. Epub 2008 Feb 29. PMID: 18310593; PMCID: PMC3623293.

Archived link

Canadian Attention Deficit Hyperactivity Disorder Resource Alliance (CADDRA) ADHD Questionnaires

Archived link