Table 2.

Characteristics of aneurysms and patients

	Rate	95 % CI	N
Posterior circulation aneurysm
Small	0.29	0.22–0.37	48
Large	0.48	0.40–0.56	79
Giant	0.23	0.17–0.30	38
Saccular	0.34	0.27–0.42	58
Not saccular	0.66	0.58–0.73	111
Ruptured	0.16	0.10–0.22	25
Unruptured	0.84	0.78–0.90	136
Retreatment	0.26	0.18–0.36	27
First treatment	0.74	0.64–0.82	75
Patient
Symptomatic	0.61	0.51–0.70	62
Asymptomatic	0.39	0.3–0.49	40

CI confidence interval, N number