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Table 1: Overall characteristics
Characteristics No.
Total studies 2003
Location 
    University of New Mexico 139 (6.9%)
    University of Pennsylvania 170 (8.5%)
    University of Pittsburgh 649 (32%)
    Stanford 710 (35%)
    Baylor College of Medicine 236 (12%)
    Medical College of Wisconsin 82 (4%)
    Medical College of Virginia 17 (0.8%)
Mechanically ventilated 517 (25.8%)
Chemically paralyzed 211 (40.7% of ventilated)
Nonventilated 1486 (74.2%)
Indication (some studies listed several) 
    Occlusive vascular disease 705 (35%)
    Ischemic stroke 537 (27%)
    Traumatic brain injury 323 (16%)
    Vasospasm after subarachnoid hemorrhage 271 (14%)
    Hemorrhagic stroke 96 (4.8%)
    Skull base aneurysm or tumor 62 (3.1%)
    Epilepsy 5 (0.2%)
    Brain tumor 3 (0.15%)
    Dementia 2 (0.1%)
    Hydrocephalus 1 (0.05%)
    Other 6 (0.3%)

Characteristics	No.
Total studies	2003
Location
University of New Mexico	139 (6.9%)
University of Pennsylvania	170 (8.5%)
University of Pittsburgh	649 (32%)
Stanford	710 (35%)
Baylor College of Medicine	236 (12%)
Medical College of Wisconsin	82 (4%)
Medical College of Virginia	17 (0.8%)
Mechanically ventilated	517 (25.8%)
Chemically paralyzed	211 (40.7% of ventilated)
Nonventilated	1486 (74.2%)
Indication (some studies listed several)
Occlusive vascular disease	705 (35%)
Ischemic stroke	537 (27%)
Traumatic brain injury	323 (16%)
Vasospasm after subarachnoid hemorrhage	271 (14%)
Hemorrhagic stroke	96 (4.8%)
Skull base aneurysm or tumor	62 (3.1%)
Epilepsy	5 (0.2%)
Brain tumor	3 (0.15%)
Dementia	2 (0.1%)
Hydrocephalus	1 (0.05%)
Other	6 (0.3%)