Table 1: Univariate statistics.

Year2000/20012002/20032004/20052006/2007PTotal
Number of IVM-related admissions 58,051

Total number of admissions73,605,20676,024,68077,825,62078,992,164306,447,670
Age, years (SD)48.3 (17.1)47.8 (17.4)49.2 (17.2)50.1 (17.3)<0.00148.9 (17.3)
Women (%)51.551.851.754.2<0.00152.4
Admission type (%)<0.001
 Emergent4239.749.55146
 Urgent18.118.315.615.916.9
 Elective39.941.834.532.837
 Emergent and urgent60.15865.166.962.9
Disposition (%)<0.001
 Routine74.777.574.172.874.7
 Short-term hospital53.74.14.64.4
 Another type facility13.411.211.913.412.5
 Home health care4.74.96.36.55.7
 Against medical advice0.30.61.10.80.7
 Died1.922.41.80.0052
 Bad outcome*20.318.721.722.5<0.00120.9
Length of stay, days5.9 (8.2)5.4 (8.3)5.4 (7.2)5.4 (8.8)<0.0015.5 (8.2)
Number of diagnoses, any4.9 (3.1)5.2 (3.3)5.9 (3.5)6.8 (4.2)<0.0015.8 (3.6)
Number of procedures, any2.0 (2.1)1.9 (2.0)1.8 (2.0)2.0 (2.4)<0.0012.0 (2.2)
Race<0.001
 White69.067.969.664.367.5
 Black10.912.112.112.411.9
 Hispanic11.913.012.015.613.2
 Asian4.73.33.03.43.6
 Native American0.30.30.31.10.5
 Other3.13.33.03.23.1
Specific diagnosis all ranks
 Any ICrH17.514.014.813.7<0.00114.9
 SAH54.04.34.50.0014.4
 ICH11.99.29.58.4<0.0019.7
 Other ICrH1.41.51.61.80.0681.6
 Seizure33.832.530.031.1<0.00131.8
 Headache7.17.810.111.7<0.0019.3
 Acute ischemic stroke5.96.17.27.9<0.0016.8
 TIA2.12.12.73.1<0.0012.5
Primary specific diagnosis only72.171.666.565.2<0.00168.6
 Any ICrH12.69.311.49.4<0.00110.6
 Seizure5.75.15.67.0<0.0015.9
 Headache1.41.52.41.9<0.0011.8
 Acute cerebral ischemia2.42.43.54.1<0.0013.1
 TIA1.61.51.72.00.0041.7
 IVM48.451.841.940.8<0.00145.5
Intracranial ICA aneurysm, unruptured2.52.72.82.70.3052.7
Procedures
 Cerebral angiogram39.738.834.834.9<0.00137.0
 Embolization15.517.418.4<0.00113.4
 Surgery14.912.911.312.3<0.00112.8
 Radiosurgery2.53.31.40.7<0.0011.9
 Aneurysm clipping1.91.31.21.2<0.0011.4
 Embolization, and surgery0.11.21.62.5<0.0011.4
 No procedure80.168.670.870.2<0.00172.2
Mechanical ventilation, all durations5.44.85.85.9<0.0015.5
 <96 hours3.22.53.43.9<0.0013.3
 ≥96 hours2.42.32.42.00.0572.3

*Death, another type facility, or home health care. 1%, misrepresentative figure, likely due to false or not coding. Standard deviation in parenthesis. Abbreviations: ICrH: intracranial hemorrhage, SAH: subarachnoid hemorrhage, ICH: intracerebral hemorrhage, TIA: transient ischemic attack, IVM: intracranial vascular malformation, ICA: internal carotid artery.