Every Peddler Praises His Own Needle: Have Clinical Rules in the Diagnosis of Subarachnoid Hemorrhage Supplanted Lumbar Punctures Yet?

摘要

The 95% confidence interval (shaded area) narrows as the control:case ratio goes from 1 to 3, however confidence intervals for ratios greater than 3 are not sufficiently narrower to justify the cost and effort of recruiting additional controls.