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12 Cards in this Set
- Front
- Back
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Control Event Rates (CER)
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Control Event Occurred/Total
(Expressed as Percentages) |
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Experimental Event Rates (EER)
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Experimetal Event Occurred/Total
(Expressed as Percentages) |
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Number Needed to Treat (NNT)
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1/ARR
If ARR is .97%, then 1/.0097 |
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Absolute Risk Reduction (ARR)
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|CER-EER| = ARR
(Expressed as Percentages) |
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Relative Risk Reductions (RRR)
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(|CER-EER|)/CER
(Expressed as Percentages) |
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Relative Risk (RR)
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(a/(a+b))/(c/(c+d))
-or- EER/CER |
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A 95% CI for ARR, example
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ARR +/- 2(SE)
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Inclusion of zero in the ARR confidence interval range indicates what?
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The difference in risk is not statistically significant.
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Equation for
ARR ARI ABR ABI |
|CER-EER|=
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Equation for:
RRR RRI RBR RBI |
(|CER-EER|)/CER
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Odds Ratio (OR)
Ratio of the odds of the outcome in the experimental group to the odds in the control group. |
(ad)/(bc)
(Happened in exp X Didn't happen in control)/ (Didn't happen in exp X did happen in control) |
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What value included in the CI would invalidate the results for
ARR? OR? RR? |
Zero
One |
