| Grade | Description |
|---|---|
| Grade 0 | No chills |
| Grade 1 | Mild muscle bundle chills in the face or neck, or fine miscellaneous waves on ECG |
| Grade 2 | Visible chills in more than one muscle group |
| Grade 3 | Multiple muscles including whole body activity |
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| Grade | Description |
|---|---|
| Grade 0 | No chills |
| Grade 1 | Mild muscle bundle chills in the face or neck, or fine miscellaneous waves on ECG |
| Grade 2 | Visible chills in more than one muscle group |
| Grade 3 | Multiple muscles including whole body activity |