Table 1 Clinical Grading as defined by the World Federation of Neurological Surgeons (WFNS), Hunt & Hess and in relation to the Glasgow Coma Scale (GCS)

I

asymptomatic, or minimal headache and neck stiffness

15

absent

II

severe headache, neck stiffness, cranial nerve palsy (optional)

13–14

absent

III

drowsiness, minimal neurologic deficit

13–14

absent

IV

stupor, severe neurologic deficit (hemiparesis), vegetative disturbances

7–12

present or absent

V

coma, signs of decerebration

3–6

present or absent