0 No SAH or IVH: very low risk |
1 Focal or diffuse thin layer of SAH, no IVH: low risk |
2 Focal or diffuse thin layer of SAH, IVH present: moderate risk |
3 Focal or diffuse thick layer of SAH, no IVH: high risk |
4 Focal or diffuse thick layer of SAH, IVH present: very high risk |