MDAAT — Myositis Disease Activity Assessment Tool

Evaluate disease activity in inflammatory myopathies (dermatomyositis, polymyositis, inclusion body myositis) using the Myositis Disease Activity Assessment Tool across extramuscular and muscle activity domains.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ 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.
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How It Works

Evaluate disease activity in inflammatory myopathies (dermatomyositis, polymyositis, inclusion body myositis) using the Myositis Disease Activity Assessment Tool across extramuscular and muscle activity domains

Each component has a specific meaning:

  • Muscle activity domains — The muscle activity domains recorded for the scenario being assessed.

Note: Interpret the mdaat score result against the thresholds and context described above.

How to Use

Enter the muscle activity domains for the scenario you are assessing. Evaluate disease activity in inflammatory myopathies (dermatomyositis, polymyositis, inclusion body myositis) using the Myositis Disease Activity Assessment Tool across extramuscular and muscle activity domains. Use the mdaat score result to inform your calculation.

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Frequently Asked Questions