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Table 1: Demographic and aneurysm characteristics
Characteristics IPH/Subtotal OR P Value
Sex 
    Male 2.5% (4/161) Ref 
    Female 2.5% (16/632) 1.02 (0.34–3.09) .97
Hypertension 
    Yes 5.2% (13/249) 2.45 (0.96–6.23) .06
    No 2.2% (7/318) Ref 
Controlled hypertension 
    Yes 5.8% (12/206) 0.58 (0.02–15.92) .75
    No 0.0% (0/4) Ref 
Current smoker 
    Yes 3.2% (3/94) 1.32 (0.38–4.60) .66
    No 2.4% (17/699) Ref 
Aneurysm location 
    Posterior circulation 2.2% (2/89) Ref 
    Anterior circulation 2.6% (18/704) 1.14 (0.26–5.00) .86
Aneurysm location by vessel 
    Internal carotid artery 2.4% (14/590) Ref 
    PcomA 3.8% (2/53) 1.61 (0.36–7.30) .78
    ACA 25.0% (2/8) 13.71 (2.54–74.02) .01
    Basilar artery 2.3% (1/43) 0.98 (0.13–7.63) .43
    Vertebral artery 3.0% (1/33) 1.29 (0.16–10.09) .63
Rupture status 
    Unruptured 1.9% (14/719) Ref 
    Ruptured 8.1% (6/74) 4.44 (1.65–11.94) .00
Aneurysm type 
    Saccular 2.0% (12/600) Ref 
    Fusiform 3.9% (4/102) 1.92 (0.42–8.82) .91
    Dissecting 3.8% (2/53) 2.00 (0.63–6.33) .82
    Other 5.3% (2/38) 2.72 (0.59–12.63) .48
Aneurysm size 
    <10 mm 1.6% (6/387) Ref 
    10–24.9 mm 3.3% (11/338) 2.14 (0.78–5.84) .70
    ≥25 mm 4.8% (3/63) 3.18 (0.77–13.04) .23
Note:—PcomA indicates posterior communicating artery; ACA, anterior cerebral artery; Ref, reference.