The 3-Item Stroke Scale (3I-SS)60
| Item | Points |
|---|---|
| Consciousness disturbance | |
| None | 0 |
| Mild | 1 |
| Severe | 2 |
| Gaze and head deviation | |
| Absent | 0 |
| Incomplete | 1 |
| Complete | 2 |
| Hemiparesis | |
| Absent | 0 |
| Moderate | 1 |
| Severe | 2 |
| Total score | 0–6 |
3I-SS ≥4: 67% sensitivity, 92% specificity, 0.36 negative likelihood ratio for large vessel occlusion.