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Table 1: Baseline characteristics
Parameter Solitary Aneurysm Tandem Aneurysms P Value
No. of PEDs placed 184 34 –
Aneurysms treated with single PED 184 78 –
    1 184 – –
    2 – 28 –
    3 – 3 –
    4 – 2 –
    5 – 1 –
Sex 
    Female 166 (90.2%) 31 (91.2%) .86
    Male 18 (9.8%) 3 (8.8%)
Median age (median) (range) (yr) 58 (24–82) 50.5 (19–75) .006
Smoking (No.) 42 (22.8%) 18 (52.9%) <.001
Pretreatment mRS (No.) 
    0–2 180 (97.8%) 32 (94.1%) .23
    3–5 4 (2.2%) 2 (5.9%)
Aneurysm location 
    Cavernous 25 (13.6%) 7 (9%) .53
    Paraophthalmic 133 (72.3%) 61 (78.2%)
    Posterior communicating 26 (14.1%) 10 (12.8%)
Aneurysm measurements (median) (range) (mm) 
    Maximal diameter 6.2 (1.6–28.3)^{^a} 6.7 (2–40) .48
    Neck size 4 (1–14.3)^{^b} 3.9 (1.8–8.5)^{^c} .14
Daughter sac (No.) 46 (25.1%) 12 (15.4%) .08
Subarachnoid hemorrhage (No.) 
    Acute (<2 weeks) 4 (2.2%) 3 (8.8%) .11
    Remote (>2 weeks) 19 (10.3%) 2 (5.9%)
Prior treatment (No.) 
    Endovascular 23 (12.5%) 2 (2.6%) .031
    Surgery 6 (3.3%) 0
    Both 2 (1.1%) 1 (1.3%)
Clopidogrel responders (No.) 
    Yes 123 (68.7%)^{^d} 24 (75%)^{^e} .48
    No 56 (31.3%) 8 (25%)
↵a Data are missing for 25 aneurysms.
↵b Data are missing for 50 aneurysms.
↵c Data are missing for 2 aneurysms.
↵d Data are missing for 5 procedures.
↵e Data are missing for 2 procedures.