How well does the Ottawa Subarachnoid Hemorrhage Rule detect or rule out subarachnoid hemorrhage?

BEEM Bottom Line

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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