WFNS (World Federation of Neurosurgical Societies)
Grade 1
GCS score of 15 without focal deficit
Grade 2
GCS score of 13 or 14 without focal deficit 0.5
Grade 3
GCS score of 13 or 14 with focal deficit 0.5
Grade 4
GCS score of 7-12 0.5
Grade 5
GCS score of 3-6 0.5