Fig. 1From: Effects of frailty on postoperative clinical outcomes of aneurysmal subarachnoid hemorrhage: results from the National Inpatient Sample databaseFlowchart of study subject selection. aSAH, aneurysmal subarachnoid hemorrhage; SICH, spontaneous intracerebral hemorrhage; HCUP, Healthcare Cost and Utilization Project; NIS, Nationwide Inpatient SampleBack to article page