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Table 6: Procedure-related adverse events and mortality: comparison of assist device versus unassisted coiling cases
Randomized Treatment
Hydrogel Bare Platinum Absolute Difference
No. % No. % (95% CI)
Procedure-related adverse event 
    Stent used in acutely ruptured aneurysm 2/3 66.7 2/3 66.7 0% (−53% to +53%)
    Stent used in unruptured aneurysm 7/43 16.3 9/49 18.4 −2.1% (−17% to +14%)
    Balloon/other assist used in acutely ruptured aneurysm 9/32 28.1 8/30 26.7 +1.5% (−20% to +23%)
    Balloon/other assist used in unruptured aneurysm 9/38 23.7 6/31 19.4 +4.3% (−16% to +23%)
    No assist device, acutely ruptured aneurysm 18/104 17.3 22/101 21.8 −4.5% (−15% to +6.4%)
    No assist device, unruptured aneurysm 2/28 7.1 6/34 17.6 −10.5% (−27% to +7.6%)
Mortality rate (0–3 months) 
    Stent used in acutely ruptured aneurysm 2/3 66.7 2/3 66.7 0% (−53% to +53%)
    Stent used in unruptured aneurysm 0/43 0 1/49 2.0 −2% (−11% to +6.3%)
    Balloon/other assist used in acutely ruptured aneurysm 4/32 12.5 1/30 3.3 +9.2% (−6.1% to +25%)
    Balloon/other assist used in unruptured aneurysm 1/38 2.6 0/31 0 +2.6% (−8.6% to +14%)
    No assist device, acutely ruptured aneurysm 2/104 1.9 1/101 1.0 +0.9% (−3.7% to +5.8%)
    No assist device, unruptured aneurysm 0/28 0 0/34 0 0% (−10% to +12%)
Note:—CI indicates confidence interval.