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historical controls |
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historical controls use of historical information as a comparison group in a study; that is a before and after comparison. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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c) In male historical controls (2,265 rats), the overall incidence of lymphomas/leukemias is 20. Although this ISR rate is similar to historical controls for de novo stenting, these patients were most likely in a higher risk cohort, having had at least one prior episode of restenosis. The number of recently observed dead birds (cases) inside and outside the potential cluster is compared with the expected case-count on the basis of the geographic distribution of historical controls. |
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