Risk Computations Flashcards
1
Q
Absolute Risk Reduction
A
Ic-Irx , the propportion of patients who did not develop adverse effects because of the drug
2
Q
Relative Risk
A
Irx/Ic (relative starts with R, rx starts with R)
tells us the stroke risk of those taking warfarin was one 1/3 the risk of those not taking warfarin
3
Q
Relative Risk Reduction
A
1-RR (Irx/Ic)
-Amount of risk removed as a result of baseline therapy
4
Q
Number Needed to Treat
A
1/ARR (Ic-Irx)
How many patients need to be treated to prevent one outcome
5
Q
What is Type 1 error?
A
No difference => false positive
6
Q
What is Type 2 errors?
A
Difference => false negative
