Table 2:

Baseline data on randomization

	Randomized Treatment
	Hydrogel		Bare Platinum
	No.	%	No.	%
Total No. patients randomized	249		250
Sex
Female	176	70.7	174	69.6
Male	73	29.3	76	30.4
Age (years)
<45	80	32.1	78	31.2
46–55	68	27.3	75	30.0
>55	101	40.6	97	38.8
Target aneurysm size (maximal dimension)
2–4.9 mm	42	16.9	41	16.4
5–9.9 mm	144	57.8	144	57.6
10–24.9 mm	63	25.3	65	26.0
Dome-to-neck ratio
<1.5	83	33.3	81	32.4
>1.5	166	66.7	169	67.6
Baseline rupture status
Yes, in previous 30 days	132	53.0	133	53.2
Yes, >30 days ago	5	2.0	4	1.6
Yes, but date unknown	2	0.8	1	0.4
No	110	44.2	112	44.8
Aneurysm shape
Irregular (multilobulated)	76	30.5	77	30.8
Not multilobulated	173	69.5	173	69.2
Planned use of assist device
Yes	112	45.0	115	46.0
No	122	49.0	121	48.4
Missing (see “Results”)	15	6.0	14	5.6
Assist device actually used ^*	116	46.6	115	46.0
Balloon	65	26.1	60	24.0
Stent	46	18.5	52	20.8
Other (TriSpan^† double microcatheter techniques)	3	1.2	3	1.2
Assist device attempted but failed	2	0.8	0	0
Not known (consent withdrawn)	1	0.4	0	0
None	131		137
Randomized Americas^‡
Yes	89	35.7	89	35.6
No	160	64.3	161	64.4