What T-score on Conners indicates clinical significance?

T-scores of 65–69 (1.5 SD above mean) are borderline clinical; T-scores of 70 or above (2 SD above mean) are clinically significant and warrant comprehensive ADHD evaluation. Raw scores are converted to T-scores based on age and gender normative data.

How does the Conners differ from Vanderbilt?

Conners scales are standardized with extensive normative data, available in long (80+ items) and short (10-item Conners Index) forms, and more sensitive to medication response monitoring. Vanderbilt is free and widely used in primary care. Conners is often preferred in specialty settings.

Conners ADHD Inattention-Hyperactivity Index

Calculate the Conners Index score from parent or teacher Conners Rating Scale to identify clinically significant ADHD symptoms using T-score threshold of 65 or above for referral.

Use the full interactive calculator below, or

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Conners ADHD Inattention-Hyperactivity Index

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Frequently Asked Questions

What T-score on Conners indicates clinical significance?

How does the Conners differ from Vanderbilt?