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TABLE 1: Baseline study design and aneurysm data
Clipping Coiling 
Studies 
    Retrospective single center 21 10 
    Prospective single center 1 5 
    Multicenter or community-based 8 4 
        Total 30 19 
Patient baseline information 
    Mean age (y) 57.0 53.1 
Aneurysm size UIA No.^* % UIA No.^‡ % UIA No. %
    Small 1399 35.7 297 36.1 1696 35.8
    Medium 1394 35.6 236 28.7 1630 34.4
    Large 898 22.9 219 26.6 1117 23.6
    Giant 224 5.7 70 8.5 294 6.2
        Total 3915 822 4737 
Aneurysm site UIA No.^† % UIA No.^§ % UIA No. %
    Cavernous carotid artery 102 2.4 99 10.3 201 3.8
    ICA and Ophthalmic 1542 36.1 269 27.9 1811 34.6
    ACom, ACA, and pericollosal 676 15.8 173 18.0 849 16.2
        MCA 1340 31.3 117 12.1 1457 27.8
        PCom 183 4.3 71 7.4 245 4.9
    Vertebrobasilar system 239 5.6 81 8.4 320 6.1
        Basilar tip 194 4.5 153 15.9 347 6.6
            Total 4276 963 5239 
Note.—ICA indicates internal carotid artery; ACom, anterior communicating artery; ACA, anterior cerebral artery; PCom, posteror communicating artery. UIA nos. were based on the following references:
* , 11, 14, 18–24;
† , 3, 11, 14, 18–21, 23, 24, 25–27;
‡ , 3, 5, 7, 28–31;
§ , 3, 7, 28, 32.