Table 1.

Baseline demographics, imaging features, and past medical history. aSAH aneurysmal subarachnoid hemorrhage, npmSAH non-perimesencephalic SAH, pm perimesencephalic SAH; p-value, ANOVA/Kruskal–Wallis test/chi-square as appropriate (see Supplement material for multiple comparisons)

Parameter	aSAH	npmSAH	pmSAH	p-value
Total [n]	115	19	16
Age [yrs]	55 [48–65]	60 [56–68]	52 [42–60]	0.032
Female sex [n]	75 (65.2%)	9 (47.4%)	6 (37.5%)	0.0512
Hunt and Hess [grade]				0.230
I	33 (28.6%)	6 (31.6%)	9 (56.3%)
II	43 (37.4%)	8 (42.1%)	7 (43.7%)
III	39 (33.9%)	5 (26.3%)	0 (0%)
Modified Fisher grade	2 [1–3]	1 [1, 2]	1 [1]	0.0005
Loss of consciousness [n]	38/115 (33%)	0 (0%)	0 (0%)	0.0004
Past medical history and risk factors
Antiplatelet treatment [n]	18 (15.7%)	3 (15.8%)	2 (10.5%)	0.946
Anticoagulation treatment (n)	5 (4.4%)	2 (10.5%)	0 (12.5%)	0.32
Arterial hypertension [n]	55 (47.8%)	12 (63.2%)	7 (50%)	0.415
Smoking	49 (42.6%)	3 (15.8%)	1 (6.25%)	0.0028