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.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

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

Each component has a specific meaning:

Parent or teacher Conners Rating Scale — The parent or teacher conners rating scale recorded for the scenario being assessed.

Note: Interpret the conners index result against the thresholds and context described above.

How to Use

Enter the parent or teacher Conners Rating Scale for the scenario you are assessing. 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 conners index result to inform your calculation.

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