Table 1. Comparative analyses between the non-lesional and lesional EP groups

	Non-lesional EP group (n = 9)	Lesional EP group (n = 18)	p-value
Age, years	57.0 (52.5–70.5)	64.0 (58.8–71.5)	0.246
Male (n, %)	2 (22.2)	3 (16.7)	0.726
Operation duration, minutes	225.0 (157.5–247.5)	227.5 (183.8–270.0)	0.587
Right side, n (%)	2 (22.2)	11 (42.3)	0.431
Temporary clipping, n (%)	1 (11.1)	7 (38.9)	0.136
Vessel location, n (%)			0.290
MCAB	7 (77.8)	15 (83.3)
MCA	1 (11.1)	3 (16.7)
Anterior choroidal	0	0
ICA	1 (11.1)	0
Aneurysm size (mm)	3.5 (2.3–4.8)	4.2 (3.0–5.1)	0.340
Suspected event, n (%)			>0.999
PC	5 (55.6)	10 (55.6)
TC/Premature bleeding	1 (11.1)	4 (22.2)
Dura opening	3 (33.3)	2 (11.1)
Uncertain	0	2 (11.1)
PND, n (%)
Immediately postoperatively	1 (12.5)	5 (27.8)	0.628
At 1 month	0	2 (11.1)	>0.999

EP: evoked potentials; MCAB: middle cerebral artery bifurcation; MCA: middle cerebral artery; ICA: internal carotid artery; PC: permanent clipping; TC: temporary clipping; PND: postoperative neurologic deficit.