Table 1.

Patient characteristics

	No	%
Overall population	791
Woman	496	63
Men	295	37
Age
Young (< 60)	522	66
Old (≥ 60)	269	34
Etiology
Aneurysmal	568	72
Non-aneurysmal / unknown	223	28
Aneurysm size
< 7 mm	219	28
≥ 7 mm	209	26
Undetermined	363	46
WFNS
1–2	494	62
3–5	297	38
Fisher grading
1–3 (no intracerebral or intraventricular clots)	420	53
4 (intracerebral or intraventricular clots)	371	47

WFNS World Federation of Neurological Surgeons Grading System for Subarachnoid Hemorrhage