How well does the Ottawa Subarachnoid Hemorrhage Rule detect or rule out subarachnoid hemorrhage?
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Why is this study important?
The Ottawa Subarachnoid Hemorrhage (SAH) Rule was created to help emergency physicians clinically identify a potentially catastrophic cause in normally appearing emergency department (ED) patients with acute headache. This study measures how well the presence of any 1 of 6 clinical variables detects or rules out SAH.
Which, if any, threats to validity are most likely to have an impact on the results and how?
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