How to Score the Vanderbilt ADHD Rating Scale
The Vanderbilt ADHD Rating Scale uses two scoring methods: symptom count scoring (counting items rated 2 or 3 as present) and dimensional scoring (summing all item ratings), with specific cutoffs for each subscale to identify clinically significant symptoms and impairment. 1, 2
Scoring Methods
Symptom Count Scoring (DSM-Based)
- Count items rated as "2" (often) or "3" (very often) as positive symptoms 2
- For ADHD Inattentive subscale: 6 or more symptoms indicate clinical significance 2
- For ADHD Hyperactive/Impulsive subscale: 6 or more symptoms indicate clinical significance 2
- For Oppositional Defiant Disorder subscale: 4 or more symptoms indicate clinical significance 2
- For Conduct Disorder subscale: 3 or more symptoms indicate clinical significance 2
- For Anxiety/Depression subscale: 3 or more symptoms indicate clinical significance 2
Dimensional Scoring (Continuous Scale)
- Sum all item ratings (0-3) for each subscale to create a total score 2
- This method provides a continuous measure of symptom severity rather than categorical presence/absence 2
- Higher scores indicate greater symptom severity 2
- National norms and percentiles are available for dimensional scoring to compare individual children to representative samples 2
Performance Items Scoring
The performance section assesses functional impairment across academic and behavioral domains 3
- Performance items are rated on a 5-point scale: 1 (excellent), 2 (above average), 3 (average), 4 (somewhat of a problem), 5 (problematic) 3
- For diagnostic purposes, at least one performance item must be rated as "4" or "5" to demonstrate functional impairment in a major setting 4, 5
- A cutoff score of 7.5 for the sum of parent and teacher reading items has excellent utility for ruling out reading and spelling learning disorders 3
- A cutoff score of 4 for teacher reading items alone effectively rules out comorbid reading disorders 3
- A cutoff score of 4 for teacher writing items effectively rules out comorbid spelling disorders 3
Critical Scoring Considerations
Multiple Informants Required
- Obtain both parent and teacher versions to document symptoms and impairment across multiple settings, as required by DSM-5 criteria 4, 6, 5
- Interrater agreement between different informants is typically poor, which is expected and reflects different behavioral presentations across settings 7
Age and Sex Considerations
- While statistically significant differences exist between age groups (particularly for hyperactivity and anxiety/depression subscales) and sex (for inattentive, hyperactive, and ODD subscales), these differences are modest and do not require separate cutoffs for screening purposes 2
- The same scoring thresholds apply across ages 5-12 years and for both sexes 2
Clinical Utility Limitations
- The Vanderbilt performance items do NOT effectively identify or rule out math learning disorders 3
- The scale should be used alongside clinical interview about school functioning and review of school records, not as a standalone diagnostic tool 3
- The scale demonstrates strong discriminative validity for ADHD but weaker validity for conduct-related subscales 7