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Table 3: Initial and follow-up angiographic outcome in traditional unassisted and balloon-assisted coiling of cerebral aneurysms
Variable Balloon Nonballoon
% Occlusion No. of Total Patients No. of Studies % Occlusion No. of Total Patients No. of Studies
Initial total occlusion 73 141 4 49 283 8
Initial subtotal occlusion 22 39 
Initial incomplete occlusion 5 13 
Follow-up total occlusion 72 138 5 54 193 8
Follow-up subtotal occlusion 17 34 
Follow-up incomplete occlusion 10 11

Variable	Balloon			Nonballoon
Variable	% Occlusion	No. of Total Patients	No. of Studies	% Occlusion	No. of Total Patients	No. of Studies
Initial total occlusion	73	141	4	49	283	8
Initial subtotal occlusion	22			39
Initial incomplete occlusion	5			13
Follow-up total occlusion	72	138	5	54	193	8
Follow-up subtotal occlusion	17			34
Follow-up incomplete occlusion	10			11